UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report: November 18, 2011

Willis Lease Finance Corporation

(Exact Name of Registrant as Specified in Charter)

773 San Marin Drive, Suite 2215

Novato, California 94998

(Address of Principal Executive Offices) (Zip Code)

Registrant’s telephone number, including area code: (415) 408-4700

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

On November 18, 2011, the Company entered into an Amended and Restated Credit Agreement dated as of November 18, 2011 (the “Credit Agreement”) among the Company, Union Bank, N.A., as Administrative Agent, Joint Lead Arranger and Sole Bookrunner, Wells Fargo Bank, National Association as Syndication Agent, Wells Fargo Securities, LLC as Joint Lead Arranger, U.S. Bank, N.A., as Documentation Agent and Joint Lead Arranger, and the various lenders party to the Credit Agreement. This Credit Agreement refinances the loans outstanding under the Company’s existing Credit Agreement, dated as of November 18, 2009 among the Company, Union Bank, N.A., as Administrative Agent and Security Agent and certain banks named therein. The new credit facility is available to finance the acquisition of aircraft engines and related equipment as well as for general working capital purposes.

The Credit Agreement provides a $345 million revolving credit facility for a term of five years and is secured by substantially all of the Company’s assets. Total availability under the Credit Agreement is subject to a borrowing base calculation that includes specified percentages of the net book value of eligible aircraft engines, airframes and related equipment. The terms of the Credit Agreement also allow the Company from time to time to request an increase of the original $345 million revolving commitment up to an aggregate amount of $450 million.

At the Company’s option, loans under the Credit Agreement will bear interest at either the base rate or LIBOR, plus, in each case, an applicable interest margin. The base rate will be equal to the highest of (1) the “Reference Rate” of Union Bank, N.A., as published from time to time, (2) the Federal Funds Rate as published by the Federal Reserve Bank of New York plus 0.50%, and (3) the one-month LIBOR rate plus 1.50%. The applicable margin for loans under the Credit Agreement ranges from 1.00% to 1.75% per annum in the case of base rate loans and from 2.50% to 3.25% in the case of LIBOR loans, in each case based upon the Leverage Ratio (as defined in the Credit Agreement) for the Company and its subsidiaries. The initial applicable margin for loans under the Credit Agreement will be 1.25% in the case of base rate loans, and 2.75% in the case of LIBOR loans.

The Credit Agreement contains certain usual and customary affirmative and negative covenants which include, among others, financial covenants, limitations on liens, additional indebtedness, further negative pledges, investments, payment of dividends, mergers, and restricted payments. The financial covenants include maintenance of a minimum consolidated net worth, maintenance of a maximum consolidated leverage ratio, and a minimum consolidated fixed charge coverage ratio. The Credit Agreement also contains usual and customary events of default, including, among others, non-payment of principal, interest, fees and other amounts; material breach of a representation or warranty; non-performance of covenants and obligations; default on other material debt; bankruptcy or insolvency; material judgments; material adverse changes; and change in control.

On November 21, 2011, the Company issued a Press Release announcing the new Credit Agreement. A copy of this Press Release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

The Company hereby furnishes the following exhibit pursuant to Item 7.01, “Regulation FD Disclosure”.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated November 21, 2011