SECURITIES & EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ----------------------

                                  SCHEDULE 13D*
                                 (Rule 13d-101)


           INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO
           13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(a)

                       NAVISTAR INTERNATIONAL CORPORATION
                                (Name of Issuer)

                                  Common Stock

                         (Title of Class of Securities)

                                    63934E108
                                 (CUSIP Number)

                        Owl Creek Asset Management, L.P.
     640 Fifth Avenue, 20th Floor, New York, NY 10019, Attn: Daniel Sapadin
                                 (212) 688-2550


                  (Name, address and telephone number of person
                authorized to receive notices and communications)

                                January 24, 2008
             (Date of event which requires filing of this statement)


          If the filing person has previously filed a statement on Schedule 13G
to report the acquisition that is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(e), Rule 13d-1(f) or Rule 13d-1(g),
check the following box [ ]

     NOTE: Schedules filed in paper format shall include a signed original and
five copies of the schedule, including all exhibits. See Rule 13d-7 for other
parties to whom copies are to be sent.

     *The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.

     The information required in the remainder of this cover page shall not be
deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act
of 1934 ("Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act (however, see the
Notes).

                              (Page 1 of 17 Pages)








CUSIP No. 63934E108             13D              Page 2 of 17 pages

------------------------------------------------------------------------------
     (1)    NAME OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NOS.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                           Owl Creek I, L.P.
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [ ]
                                                                  (b)  [X]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    SOURCE OF FUNDS **
                        WC, OO
-----------------------------------------------------------------------------
     (5)    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
            REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                    [ ]
-----------------------------------------------------------------------------
     (6)    CITIZENSHIP OR PLACE OF ORGANIZATION
                            Delaware
-----------------------------------------------------------------------------
NUMBER OF      (7)  SOLE VOTING POWER
                                                -0-
SHARES         --------------------------------------------------------------

BENEFICIALLY   (8)  SHARED VOTING POWER
                                                 129,400

OWNED BY       --------------------------------------------------------------

EACH           (9)  SOLE DISPOSITIVE POWER
                                                -0-
REPORTING      --------------------------------------------------------------

PERSON WITH    (10) SHARED DISPOSITIVE POWER
                                                129,400

-----------------------------------------------------------------------------
     (11)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON           129,400

-----------------------------------------------------------------------------
     (12)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (11) EXCLUDES CERTAIN SHARES **                    [ ]
-----------------------------------------------------------------------------
     (13)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (11)
                                                0.18%
-----------------------------------------------------------------------------
     (14)   TYPE OF REPORTING PERSON **
                                                PN
-----------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 63934E108               13D              Page 3 of 17 Pages

-----------------------------------------------------------------------------
     (1)    NAME OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NOS.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                          Owl Creek II, L.P.
-----------------------------------------------------------------------------
     (2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [ ]
                                                                  (b)  [X]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    SOURCE OF FUNDS **
                        WC, OO
-----------------------------------------------------------------------------
     (5)    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
            REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                    [ ]
-----------------------------------------------------------------------------
     (6)   CITIZENSHIP OR PLACE OF ORGANIZATION
                            Delaware
-----------------------------------------------------------------------------
NUMBER OF      (7)  SOLE VOTING POWER
                                                -0-
SHARES         --------------------------------------------------------------

BENEFICIALLY   (8)  SHARED VOTING POWER
                                                1,003,800
OWNED BY       --------------------------------------------------------------

EACH           (9)  SOLE DISPOSITIVE POWER
                                                -0-
REPORTING      --------------------------------------------------------------

PERSON WITH    (10) SHARED DISPOSITIVE POWER
                                                1,003,800
-----------------------------------------------------------------------------
     (11)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON           1,003,800

-----------------------------------------------------------------------------
     (12)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (11) EXCLUDES CERTAIN SHARES **                    [ ]
-----------------------------------------------------------------------------
     (13)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (11)
                                                1.43%
-----------------------------------------------------------------------------
     (14)   TYPE OF REPORTING PERSON **
                                                   PN
-----------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 63934E108               13D              Page 4 of 17 pages

-----------------------------------------------------------------------------
     (1)    NAME OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NOS.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                    Owl Creek Advisors, LLC
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [ ]
                                                                  (b)  [X]
-----------------------------------------------------------------------------
     (3)   SEC USE ONLY
-----------------------------------------------------------------------------
     (4)   SOURCE OF FUNDS **
                        WC, OO
-----------------------------------------------------------------------------
     (5)    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
            REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                    [ ]
-----------------------------------------------------------------------------
     (6)    CITIZENSHIP OR PLACE OF ORGANIZATION
                            Delaware
-----------------------------------------------------------------------------
NUMBER OF      (7)  SOLE VOTING POWER
                                                -0-
SHARES         --------------------------------------------------------------

BENEFICIALLY   (8)  SHARED VOTING POWER
                                                1,133,200

OWNED BY       --------------------------------------------------------------

EACH           (9)  SOLE DISPOSITIVE POWER
                                                -0-
REPORTING      --------------------------------------------------------------

PERSON WITH    (10) SHARED DISPOSITIVE POWER
                                                1,133,200

-----------------------------------------------------------------------------
     (11)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON           1,133,200

-----------------------------------------------------------------------------
     (12)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (11) EXCLUDES CERTAIN SHARES **                    [ ]
-----------------------------------------------------------------------------
     (13)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (11)
                                                1.61%
-----------------------------------------------------------------------------
     (14)   TYPE OF REPORTING PERSON **
                                                CO
-----------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 63934E108               13D              Page 5 of 17 Pages

-----------------------------------------------------------------------------
     (1)    NAME OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NOS.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                           Owl Creek Asset Management, L.P.
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [ ]
                                                                  (b)  [X]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    SOURCE OF FUNDS **
                        WC, OO
-----------------------------------------------------------------------------
     (5)    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
            REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                    [ ]
-----------------------------------------------------------------------------
     (6)    CITIZENSHIP OR PLACE OF ORGANIZATION
                            Delaware
-----------------------------------------------------------------------------
NUMBER OF      (7)  SOLE VOTING POWER
                                                -0-
SHARES         --------------------------------------------------------------

BENEFICIALLY   (8)  SHARED VOTING POWER
                                                3,135,554

OWNED BY       --------------------------------------------------------------

EACH           (9)  SOLE DISPOSITIVE POWER
                                                -0-
REPORTING      --------------------------------------------------------------

PERSON WITH    (10) SHARED DISPOSITIVE POWER
                                                3,135,554
-----------------------------------------------------------------------------
     (11)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON           3,135,554
-----------------------------------------------------------------------------
     (12)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (11) EXCLUDES CERTAIN SHARES **                    [ ]
-----------------------------------------------------------------------------
     (13)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (11)
                                                  4.46%
-----------------------------------------------------------------------------
     (14)   TYPE OF REPORTING PERSON **
                                                  PN
-----------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!







CUSIP No. 63934E108               13D              Page 6 of 17 Pages

-----------------------------------------------------------------------------
     (1)    NAME OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NOS.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                          Jeffrey A. Altman
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [ ]
                                                                  (b)  [X]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    SOURCE OF FUNDS **
                        WC, OO
-----------------------------------------------------------------------------
     (5)    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
            REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                    [ ]
-----------------------------------------------------------------------------
     (6)    CITIZENSHIP OR PLACE OF ORGANIZATION
                            United States
-----------------------------------------------------------------------------
NUMBER OF      (7)  SOLE VOTING POWER
                                                -0-
SHARES         --------------------------------------------------------------

BENEFICIALLY   (8)  SHARED VOTING POWER
                                                4,268,754
OWNED BY       --------------------------------------------------------------

EACH           (9)  SOLE DISPOSITIVE POWER
                                                -0-
REPORTING      --------------------------------------------------------------

PERSON WITH    (10) SHARED DISPOSITIVE POWER
                                                4,268,754
-----------------------------------------------------------------------------
     (11)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON           4,268,754
-----------------------------------------------------------------------------
     (12)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (11) EXCLUDES CERTAIN SHARES **                    [ ]
-----------------------------------------------------------------------------
     (13)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (11)
                                                  6.08%
-----------------------------------------------------------------------------
     (14)   TYPE OF REPORTING PERSON **
                                                  IN
-----------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!







CUSIP No. 63934E108               13D              Page 7 of 17 Pages

Item 1.     Security and Issuer.

            This Schedule 13D relates to the common stock, par value $.10 (the
"Common Stock"), of Navistar International Corporation (the "Issuer"), a
Delaware corporation whose principal executive offices are located at 4201
Winfield Road, P.O. Box 1488, Warrenville, Illinois 60555.

Item 2.     Identity and Background.

            (a) This statement is filed by:

                 (i) Owl Creek I, L.P., a Delaware limited partnership ("Owl
Creek I"), with respect to the shares of Common Stock beneficially owned by it;

                 (ii) Owl Creek II, L.P., a Delaware limited partnership ("Owl
Creek II"), with respect to the shares of Common Stock beneficially owned by it;

                 (iii) Owl Creek Advisors, LLC, a Delaware limited liability
company (the "General Partner"), with respect to the shares of Common Stock
beneficially owned by Owl Creek I and Owl Creek II;

                 (iv) Owl Creek Asset Management, L.P., a Delaware limited
partnership (the "Investment Manager"), with respect to the shares of Common
Stock beneficially owned by Owl Creek Overseas Fund, Ltd., an exempted company
organized under the laws of the Cayman Islands ("Owl Creek Overseas"), and Owl
Creek Socially Responsible Investment Fund, Ltd., an exempted company organized
under the laws of the Cayman Islands ("SRIF"); and

                 (v) Jeffrey A. Altman, with respect to shares of Common Stock
beneficially owned by Owl Creek I, Owl Creek II, Owl Creek Overseas and SRIF.

            The foregoing persons are hereinafter sometimes collectively
referred to as the "Reporting Persons." Any disclosures made herein with respect
to persons other than the Reporting Persons are made on information and belief
after making inquiry to the appropriate party.

            (b) The address of the principal office of the Reporting Persons is
640 Fifth Avenue, 20th Floor, New York, NY 10019.

            (c) The principal business of each of Owl Creek I and Owl Creek II
is serving as a private investment limited partnership. The principal business
of the General Partner is serving as general partner of Owl Creek I and Owl
Creek II, respectively. The principal business of the Investment Manager is
serving as Investment Manager to Owl Creek Overseas and SRIF.

            (d) None of the Reporting Persons have, during the last five years,
been convicted in a criminal proceeding (excluding traffic violations or similar
misdemeanors).





CUSIP No. 63934E108               13D              Page 8 of 17 Pages

            (e) None of the Reporting Persons have, during the last five years,
been a party to a civil proceeding of a judicial or administrative body of
competent jurisdiction and, as a result of such proceeding, was, or is subject
to, a judgment, decree or final order enjoining future violations of, or
prohibiting or mandating activities subject to, Federal or State securities laws
or finding any violation with respect to such laws.

            (f) Each of Owl Creek I, Owl Creek II and the Investment Manager is
a limited partnership organized under the laws of the State of Delaware. The
General Partner is a limited liability company organized under the laws of the
State of Delaware. Mr. Altman is a United States citizen.

Item 3.     Source and Amount of Funds and Other Consideration.

            The shares of Common Stock were purchased on margin. The Reporting
Person's margin transactions are with Morgan Stanley & Co., on such firm's usual
terms and conditions. All or part of the shares of Common Stock beneficially
owned by the Reporting Persons may from time to time be pledged with one or more
banking institutions or brokerage firms as collateral for loans made by such
bank(s) or brokerage firm(s) to Owl Creek I, Owl Creek II, Owl Creek Overseas or
SRIF. Such loans bear interest at a rate based upon the broker's call rate from
time to time in effect. Such indebtedness may be refinanced with other banks or
broker-dealers.

Item 4.     Purpose of the Transaction.

           The purpose of the acquisition of the shares of Common Stock by the
Reporting Persons is for investment, and the purchases of the shares of Common
Stock by the Reporting Persons were made in the ordinary course of business and
were not made for the purpose of acquiring control of the Company. Although the
acquisition of the shares of Common Stock by the Reporting Persons is for
investment purposes, the Reporting Persons have pursued and may in the future
pursue further discussions with management in an effort to maximize long-term
value for shareholders. Also, the Reporting Persons may at times hold
discussions with management in order to ensure that the interests of current
shareholders are protected.

            The Reporting Persons intend to dispose of the shares in one or more
open market or privately negotiated transactions or otherwise, when and if an
opportunity becomes available to do so, and may dispose of any or all of the
shares at any time. The Reporting Persons have no present plan or proposal that
would relate to or result in any of the matters set forth in subparagraphs
(a)-(j) of Item 4 of Schedule 13D. The Reporting Persons intend to review their
investment in the Issuer on a continuing basis and may engage in further
discussions with management, the board of directors, other shareholders of the
Issuer and other relevant parties concerning the business, operations,
management, strategy, board composition and future plans of the Issuer.
Depending on various factors including, without limitation, the Issuer's
financial position and strategic direction, the outcome of the discussions and
actions referenced above, actions taken by the Board of Directors, price levels
of the Common Stock, other investment opportunities available to the Reporting
Persons, conditions in the securities market and general economic and industry
conditions, the Reporting Persons may in the future take such actions with
respect to their investment in the Issuer as they deem appropriate including,
without limitation,





CUSIP No. 63934E108               13D              Page 9 of 17 Pages

purchasing additional Common Stock or selling some or all of their Common Stock,
engaging in short selling of or any hedging or similar transactions with respect
to the Common Stock, taking actions with respect to the Company's restructuring
plan and/or otherwise changing their intention with respect to any and all
matters referred to in Item 4 of Schedule 13D.

Item 5.     Interest in Securities of the Issuer.

       A. Owl Creek I, L.P.
              (a)  Aggregate number of shares beneficially owned: 129,400.
                   Percentage: 0.18% The percentages used herein and in the rest
of Item 5 are calculated based upon the 70,236,415 shares of Common Stock issued
and outstanding as of November 30, 2007 as reported by the Company in its Form
10-K for the fiscal year ended October 31, 2005, filed on December 10, 2007.
              (b) 1. Sole power to vote or direct vote: -0-
                  2. Shared power to vote or direct vote: 129,400
                  3. Sole power to dispose or  direct the disposition: -0-
                  4. Shared power to dispose or direct the disposition: 129,400
              (c) The acquisition dates, number of shares of Common Stock
acquired and the price per share for all transactions by Owl Creek I in the
Common Stock within the last 60 days, are set forth in Schedule A and are
incorporated by reference.
              (d) Owl Creek Advisors, LLC, the general partner of Owl Creek I,
has the power to direct the affairs of Owl Creek I, including decisions
respecting the receipt of dividends from the shares and the disposition of the
proceeds from the sale of the shares. Mr. Altman is the managing member of Owl
Creek Advisors, LLC and in that capacity directs its operations.
              (e) Not applicable.

      B. Owl Creek II, L.P.
              (a) Aggregate number of shares beneficially owned: 1,003,800
                  Percentage: 1.43%
              (b) 1. Sole power to vote or direct vote: -0-
                  2. Shared power to vote or direct vote: 1,003,800
                  3. Sole power to dispose or direct the disposition: -0-
                  4. Shared power to dispose or direct the disposition:
                     1,003,800
              (c) The acquisition dates, number of shares of Common Stock
acquired and the price per share for all transactions by Owl Creek II in the
Common Stock within the last 60 days, are set forth in Schedule A and are
incorporated by reference.
              (d) Owl Creek Advisors, LLC, the general partner of Owl Creek II,
has the power to direct the affairs of Owl Creek II, including decisions
respecting the receipt of dividends from the shares and the disposition of the
proceeds from the sale of the shares. Mr. Altman is the managing member of Owl
Creek Advisors, LLC and in that capacity directs its operations.
              (e) Not applicable.






CUSIP No. 63934E108               13D              Page 10 of 17 Pages

       C. Owl Creek Advisors, LLC
              (a) Aggregate number of shares beneficially owned: 1,133,200
                  Percentage: 1.61%
              (b) 1. Sole power to vote or direct vote: -0-
                  2. Shared power to vote or direct vote: 1,133,200
                  3. Sole power to dispose or direct the disposition: -0-
                  4. Shared power to dispose or direct the disposition:
                     1,133,200
              (c) Owl Creek Advisors, LLC did not enter into any transactions in
the Common Stock of the Company within the last sixty days. However, Owl Creek
Advisors, LLC is the general partner of Owl Creek I and Owl Creek II, and has
the power to direct the affairs of Owl Creek I and Owl Creek II. The acquisition
dates, number of shares of Common Stock acquired and the price per share for all
transactions by Owl Creek I and Owl Creek II in the Common Stock within the last
60 days, are set forth in Schedule A and are incorporated by reference.
              (d) Owl Creek Advisors, LLC, as the general partner of Owl Creek I
and Owl Creek II, has the power to direct the affairs of Owl Creek I and Owl
Creek II, including decisions respecting the receipt of dividends from the
shares and the disposition of the proceeds from the sale of the shares. Mr.
Altman is the managing member of Owl Creek Advisors, LLC and in that capacity
directs its operations.
              (e) Not applicable.

       D. Owl Creek Asset Management, L.P.
              (a) Aggregate number of shares beneficially owned: 3,135,554
                  Percentage: 4.46%
              (b) 1. Sole power to vote or direct vote: -0-
                  2. Shared power to vote or direct vote: 3,135,554
                  3. Sole power to dispose or direct the disposition: -0-
                  4. Shared power to dispose or direct the disposition:
                     3,135,554
              (c) Owl Creek Asset Management, L.P. did not enter into any
transactions in the Common Stock of the Company within the last sixty days.
However, Owl Creek Asset Management, L.P. is the investment manager to Owl Creek
Overseas and SRIF and has the power to direct the investment activities of Owl
Creek Overseas and SRIF. The acquisition dates, number of shares of Common Stock
acquired and the price per share for all transactions by Owl Creek Overseas and
SRIF in the Common Stock within the last 60 days, are set forth in Schedule A
and are incorporated by reference.
              (d) Owl Creek Asset Management, L.P., as the investment manager to
Owl Creek Overseas and SRIF, has the power to direct the investment activities
of Owl Creek Overseas and SRIF, including decisions respecting the receipt of
dividends from the shares and the disposition of the proceeds from the sale of
the shares. Mr. Altman is the managing member of the general partner of Owl
Creek Asset Management, L.P. and in that capacity directs its operations.
              (e) Not applicable.






CUSIP No. 63934E108               13D              Page 11 of 17 Pages


       E. Jeffrey A. Altman
             (a) Aggregate number of shares beneficially owned: 4,268,754
                 Percentage: 6.08%
             (b) 1. Sole power to vote or direct vote: -0-
                 2. Shared power to vote or direct vote: 4,268,754
                 3. Sole power to dispose or direct the disposition: -0-
                 4. Shared power to dispose or direct the disposition:
                     4,268,754
             (c) Mr. Altman did not enter into any transactions in the Common
Stock of the Company within the last sixty days. The acquisition dates, number
of shares of Common Stock acquired and the price per share for all transactions
by Owl Creek I, Owl Creek II, Owl Creek Overseas and SRIF in the Common Stock
within the last 60 days, are set forth in Schedule A and are incorporated by
reference.
             (d) Not applicable.
             (e) Not applicable.


Item 6.     Contracts, Arrangements, Understandings or Relationships With
Respect to Securities of the Company.

            Except as described herein, there are no contracts, arrangements,
understandings or relationships (legal or otherwise) among the persons named in
Item 2 hereof and between such persons and any person with respect to any
securities of the Issuer, including, but not limited to, transfer or voting of
any other securities, finder's fees, joint ventures, loan or option
arrangements, puts or calls, guarantees of profits, divisions of profits or
loss, or the giving or withholding of proxies.







CUSIP No. 63934E108               13D              Page 12 of 17 Pages

Item 7.     Materials to be Filed as Exhibits.

Exhibit 1. Joint Filing Agreement







CUSIP No. 63934E108               13D              Page 13 of 17 Pages

                                SIGNATURES

            After reasonable inquiry and to the best of knowledge and belief of
the undersigned, the undersigned certify that the information set forth in this
statement is true, complete and correct.

DATED:  January 31, 2008

                                  /s/ JEFFREY A. ALTMAN
                                  ---------------------
                                 Jeffrey A. Altman, individually, and as
                                 managing member of Owl Creek Advisors, LLC,
                                 for itself and as general partner of
                                 Owl Creek I, L.P. and Owl Creek II L.P.,
                                 and as managing member of the general
                                 partner of Owl Creek Asset Management, L.P.,
                                 for itself and as investment manager to Owl
                                 Creek Overseas Fund, Ltd. and Owl Creek
                                 Socially Responsible Investment Fund, Ltd.





CUSIP No. 63934E108               13D              Page 14 of 17 pages

                           Schedule A

                       OWL CREEK I, L.P.



                                   Open
                                  market/     Price
  Date of      Number of shares   Cross       per
 Transaction  Purchased/(Sold)  Transaction   share
 -----------  ----------------  -----------   -----

   11/28/2007      1,500.00      O           49.62

    12/1/2007     (1,800.00)     C           51.95

    12/7/2007        400.00      O           53.55

   12/10/2007        200.00      O           55.62

   12/10/2007        900.00      O           55.57

     1/1/2008       (300.00)     C           54.20

    1/24/2008        900.00      O           48.47

    1/24/2008     10,900.00      O           48.51

    1/25/2008      9,100.00      O           48.48

    1/29/2008      2,600.00      O           48.25








CUSIP No. 63934E108               13D              Page 15 of 17 Pages

                       OWL CREEK II, L.P.


                                   Open
                                  market/     Price
  Date of      Number of shares   Cross        per
 Transaction  Purchased/(Sold)  Transaction   share
 -----------  ----------------  -----------   -----

   11/28/2007    11,800.00       O           49.62

    12/1/2007    (8,500.00)      C           51.95

    12/7/2007     1,800.00       O           53.55

   12/10/2007     1,800.00       O           55.62

   12/10/2007     6,700.00       O           55.57

     1/1/2008   (18,300.00)      C           54.20

    1/24/2008     5,300.00       O           48.47

    1/24/2008    84,400.00       O           48.51

    1/25/2008    72,400.00       O           48.48

    1/29/2008    20,600.00       O           48.25






CUSIP No. 63934E108               13D              Page 16 of 17 Pages

                       OWL CREEK OVERSEAS FUND, LTD.


                                   Open
                                  market/     Price
  Date of      Number of shares   Cross       per
 Transaction  Purchased/(Sold)  Transaction   share
 -----------  ----------------  -----------   -----

   11/28/2007    35,600.00       O           49.62

   12/1/2007     13,100.00       C           51.95

   12/7/2007      7,700.00       O           53.55

  12/10/2007      5,300.00       O           55.62

  12/10/2007     16,600.00       O           55.57

    1/1/2008     23,400.00       C           54.20

   1/24/2008      4,419.00       O           48.47

   1/24/2008    252,400.00       O           48.51

   1/25/2008    211,500.00       O           48.48

   1/29/2008     73,400.00       O           48.25





CUSIP No. 63934E108               13D              Page 17 of 17 Pages

              OWL CREEK SOCIALLY RESPONSIBLE INVESTMENT FUND, LTD.


                                   Open
                                  market/     Price
  Date of      Number of shares   Cross       per
 Transaction  Purchased/(Sold)  Transaction   share
 -----------  ----------------  -----------   -----

  11/28/2007      1,100.00       O           49.62

   12/1/2007     (2,800.00)      C           51.95

   12/7/2007        100.00       O           53.55

  12/10/2007        200.00       O           55.62

  12/10/2007        800.00       O           55.57

    1/1/2008     (4,800.00)      C           54.20

   1/24/2008      8,600.00       O           48.51

   1/25/2008      7,600.00       O           48.48

   1/29/2008      3,400.00       O           48.25






                                    EXHIBIT 1

                             JOINT FILING AGREEMENT

                            PURSUANT TO RULE 13d-1(k)

           The undersigned acknowledge and agree that the foregoing statement on
Schedule 13D is filed on behalf of each of the undersigned and that all
subsequent amendments to this statement on Schedule 13D may be filed on behalf
of each of the undersigned without the necessity of filing additional joint
filing agreements. The undersigned acknowledge that each shall be responsible
for the timely filing of such amendments, and for the completeness and accuracy
of the information concerning him or it contained herein and therein, but shall
not be responsible for the completeness and accuracy of the information
concerning the others, except to the extent that he or it knows or has reason to
believe that such information is inaccurate.

Dated:  January 31, 2008

                                 /s/ JEFFREY A. ALTMAN
                                  ---------------------
                                 Jeffrey A. Altman, individually, and as
                                 managing member of Owl Creek Advisors, LLC,
                                 for itself and as general partner of
                                 Owl Creek I, L.P. and Owl Creek II L.P.,
                                 and as managing member of the general
                                 partner of Owl Creek Asset Management, L.P.,
                                 for itself and as investment manager to Owl
                                 Creek Overseas Fund, Ltd. and Owl Creek
                                 Socially Responsible Investment Fund, Ltd.