[O'MELVENY & MYERS LLP LETTERHEAD]

                                                                     EXHIBIT 5.1


October 15, 2003

NILT Trust
Nissan-Infiniti LT
Nissan Auto Leasing LLC II
Nissan Auto Lease Trust 2003-A
990 West 190th Street
Torrance, California 90502

               Re:     NILT Trust
                       Nissan-Infiniti LT
                       Nissan Auto Leasing LLC II
                       Nissan Auto Lease Trust 2003-A
                       Amendment No. 2 to Registration Statement on Form S-1
                       Registration Nos. 333-106763, 333-106763-01,
                                333-106763-02, 333-106763-03

Ladies and Gentlemen:

      We have acted as special counsel to Nissan Auto Leasing LLC II, a Delaware
limited liability company ("NALL II"), NILT Trust, a Delaware statutory trust
("NILT Trust"), Nissan-Infiniti LT, a Delaware statutory trust ("Nissan-Infiniti
LT"), and Nissan Auto Lease Trust 2003-A, a Delaware statutory trust ("NALT
2003-A", or the "Issuer") in connection with the proposed issuance by NALT
2003-A of $1,239,700,000 aggregate principal amount of asset-backed notes (the
"Notes") to be offered pursuant to the above-referenced registration statement
on Form S-1 (such registration statement, as amended, the "Registration
Statement") relating to the Notes. The Registration Statement has been filed
with the Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "1933 Act"), and the rules and regulations promulgated thereunder.

      The Notes will be issued under and pursuant to the indenture between the
Issuer and the Indenture Trustee (as defined in the indenture). The indenture
and the amended and restated trust agreement between NALL II, as transferor, and
Wilmington Trust Company, as owner trustee, in the forms filed with the
Securities and Exchange Commission on October 15, 2003 as exhibits to Amendment
No. 2 to the Registration Statement, are herein referred to as the "Indenture"
and the "Trust Agreement", respectively.


                                       1

      In connection with this opinion letter, we have examined originals or
copies, certified or otherwise identified to our satisfaction, of the
organizational documents of the Issuer, the forms of Indenture and Trust
Agreement included as exhibits to the Registration Statement, the forms of Notes
included in the Registration Statement, and such other records, documents and
certificates of the Issuer and other instruments as we have deemed necessary for
the purpose of this opinion. In addition, we have assumed that the Indenture and
the Trust Agreement will be duly authorized, executed and delivered by the
parties thereto; that the Notes will be duly authorized, executed and delivered
substantially in the forms contemplated by the Indenture; and that the Notes
will be sold as described in the Registration Statement.

      Based upon the foregoing, we are of the opinion that:

      Assuming the due authorization of the Notes by all necessary action on the
part of the Issuer, when the Notes have been validly executed, authenticated and
issued in accordance with the Indenture and delivered against payment therefor,
the Notes will be valid and binding obligations of the Issuer, enforceable
against the Issuer in accordance with their respective terms, except as may be
limited by bankruptcy, insolvency, reorganization, moratorium or other similar
laws relating to or affecting creditors' rights generally (including, without
limitation, fraudulent conveyance laws), and by general principles of equity,
including without limitation, concepts of materiality, reasonableness, good
faith and fair dealing and the possible unavailability of specific performance
or injunctive relief, regardless of whether such enforceability is considered in
a proceeding in equity or at law.

      The opinions expressed above are limited to the federal laws of the United
States of America and the laws of the State of New York (excluding choice of law
principles thereof). We express no opinion herein as to the laws of any other
jurisdiction and no opinion regarding the statutes, administrative decisions,
rules, regulations or requirements of any county, municipality, subdivision or
local authority of any jurisdiction.

      We consent to the filing of this letter as an exhibit to the Registration
Statement and to the reference to this firm under the heading "Legal Matters" in
the form of prospectus, without admitting that we are "experts," within the
meaning of the 1933 Act or the rules or regulations of the Securities and
Exchange Commission thereunder, with respect to any part of the Registration
Statement, including this exhibit.

                                     Respectfully submitted,


                                     /s/ O'Melveny & Myers LLP


                                       2