UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): May 23, 2014 (May 22, 2014)

Aircastle Limited

(Exact Name of Registrant as Specified in Its Charter)

Bermuda

(State or Other Jurisdiction of Incorporation)

(203) 504-1020

(Registrant’s Telephone Number, Including Area Code)

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

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 (see General Instruction A.2. below):

(d) Election of New Directors

On May 22, 2014, the Board of Directors of Aircastle Limited (the “Company”) appointed Michael J. Cave to serve as a Class II director until the Annual General Meeting of Shareholders in 2017 or until his office shall otherwise be vacated pursuant to the Company’s Bye-Laws. The Board of Directors has determined that Mr. Cave is an independent director under the New York Stock Exchange listing standards, and appointed Mr. Cave to the Audit Committee and Investment Committee.

Upon his appointment to the Board of Directors of the Company, and in consideration of his ongoing service, Mr. Cave will be compensated as an independent director as described in the Company’s definitive proxy statement filed with the Securities and Exchange Commission on April 8, 2014 (the “Definitive Proxy Statement”) in connection with the 2014 Annual General Meeting of Shareholders.

On May 22, 2014, the Board of Directors, pursuant to the Shareholder Agreement, dated June 6, 2013, by and between the Company and Marubeni Corporation, also appointed Masumi Kakinoki to serve as a Class I director until the Annual General Meeting of Shareholders in 2016 or until his office shall otherwise be vacated pursuant to the Company’s Bye-Laws.

A copy of the Company’s press release announcing the appointment of Messrs. Cave and Kakinoki is attached hereto as Exhibit 99.1.

(e) Compensatory Arrangements

On May 22, 2014, shareholders of the Company approved the adoption of the Company’s 2014 Omnibus Incentive Plan (the “2014 Plan”), which was previously approved by the Company’s Compensation Committee and Board of Directors. The 2014 Plan is an important tool for attracting, retaining and motivating participants through the grant of performance-based compensation that promotes long-term shareholder value and the alignment of pay and performance.

A summary of the 2014 Plan was included in the Definitive Proxy Statement under the section entitled “Description of the 2014 Plan” beginning on page 43. The summary of the 2014 Plan in the Definitive Proxy Statement is qualified in its entirety by reference to the full text of the 2014 Plan, which is attached hereto as Exhibit 10.1 and is incorporated herein by reference.

On May 22, 2014, the Company held its Annual General Meeting of Shareholders, at which the matters set forth below, as further described in the Definitive Proxy Statement, were voted upon by holders of the Company’s common shares.

Holders of 74,506,745 common shares were present in person or by proxy at the Annual General Meeting of Shareholders.

(d) Exhibits

SIGNATURES

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

Date: May 23, 2014

Exhibit Index