Summary of Significant Accounting Policies	9 Months Ended
Sep. 30, 2011
Summary of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1. Summary of Significant Accounting Policies Organization Aircastle Limited (“Aircastle,” the “Company,” “we,” “us” or “our”) is a Bermuda exempted company that was incorporated on October 29, 2004 by Fortress Investment Group LLC and certain of its affiliates (together, the “Fortress Shareholders” or “Fortress”) under the provisions of Section 14 of the Companies Act of 1981 of Bermuda. Aircastle’s business is investing in aviation assets, including leasing, managing and selling commercial jet aircraft to airlines throughout the world and investing in aircraft related debt investments. Basis of Presentation Aircastle is a holding company that conducts its business through subsidiaries. Aircastle directly or indirectly owns all of the outstanding common shares of its subsidiaries. The consolidated financial statements presented are prepared in accordance with U.S. generally accepted accounting principles (“US GAAP”). We operate in a single segment. The accompanying consolidated financial statements are unaudited and have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial reporting and, in our opinion, reflect all adjustments, including normal recurring items, which are necessary to present fairly the results for interim periods. Operating results for the periods presented are not necessarily indicative of the results that may be expected for the entire year. Certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with US GAAP have been omitted in accordance with the rules and regulations of the SEC; however, we believe that the disclosures are adequate to make information presented not misleading. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2010. The Company’s management has reviewed and evaluated all events or transactions for potential recognition and/or disclosure since the balance sheet date of September 30, 2011 through the date on which the consolidated financial statements included in this Form 10-Q were issued. Principles of Consolidation The consolidated financial statements include the accounts of Aircastle and all of its subsidiaries. Aircastle consolidates eight Variable Interest Entities (“VIEs”) of which Aircastle is the primary beneficiary. All intercompany transactions and balances have been eliminated in consolidation. We consolidate VIEs in which we have determined that we are the primary beneficiary. We use judgment when deciding (a) whether an entity is subject to consolidation as a VIE, (b) who the variable interest holders are, (c) the potential expected losses and residual returns of the variable interest holders, and (d) which variable interest holder is the primary beneficiary. When determining which enterprise is the primary beneficiary, we consider (1) the entity’s purpose and design, (2) which variable interest holder has the power to direct the activities that most significantly impact the entity’s economic performance, and (3) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. When certain events occur, we reconsider whether we are the primary beneficiary of VIEs. We do not reconsider whether we are a primary beneficiary solely because of operating losses incurred by an entity. Recent Accounting Pronouncements In August 2010, the Financial Accounting Standards Board (“FASB”) issued an exposure draft, “Leases” (the “Lease ED”), which would replace the existing guidance in the Accounting Standards Codification (“ASC”) 840 (“ASC 840”), Leases. Under the Lease ED, a lessor would be required to adopt a right-of-use model where the lessor would apply one of two approaches to each lease based on whether the lessor retains exposure to significant risks or benefits associated with the underlying asset. In July 2011, the FASB tentatively decided on a new model for lessor accounting that would require a single approach for all leases, with a few exceptions. Under the new model, a lease receivable would be recognized for the lessor’s right to receive lease payments, a portion of the carrying amount of the underlying asset would be allocated between the right of use granted to the lessee and the lessor’s residual value and profit or loss would only be recognized at commencement if it is reasonably assured. Even though the FASB has not completed all of its deliberations, the decisions made to date were sufficiently different from those published in the Lease ED to warrant re-exposure of the revised proposal. The FASB intends to complete its deliberations and publish a revised proposed leases standard during the first half of 2012. We anticipate that the final standard may have an effective date no earlier than 2016. When and if the proposed guidance becomes effective, it may have a significant impact on the Company’s consolidated financial statements. Although we believe the presentation of our financial statements, and those of our lessees could change, we do not believe the accounting pronouncement will change the fundamental economic reasons for which the airlines lease aircraft. Therefore, we do not believe it will have a material impact on our business. In May 2011, the FASB issued ASU 2011-04 (“ASU 2011-04”), Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurements and Disclosure Requirements in U.S. GAAP and IFRSs, to improve the comparability of fair value measurements presented and disclosed in financial statements prepared in accordance with U.S. GAAP and IFRS. The amendments in this update change the wording used to describe the requirements in U.S. GAAP for measuring fair value and for disclosing information about fair value measurements which include (1) those that clarify the FASB’s intent about the application of existing fair value measurement and disclosure requirements, and (2) those that change a particular principle or requirement for measuring fair value or for disclosing information about fair value measurement. ASU 2011-04 is effective for interim and annual reporting periods beginning after December 15, 2011. The adoption of ASU 2011-04 will not have a material impact on the Company’s consolidated financial statements. In June 2011, the FASB issued Accounting Standards Update (“ASU”) 2011-05 (“ASU 2011-05”), Comprehensive Income (Topic 220): Presentation of Comprehensive Income, which gives the option to present the total of comprehensive income either in a single continuous statement of comprehensive net income or in two separate but consecutive statements. In either option, an entity is required to present each component of net income along with total net income, each component of other comprehensive income along with a total for other comprehensive income, and a total amount for comprehensive income. If a two statement approach is used, the statement of other comprehensive income should immediately follow the statement of net income. This update eliminates the option to present the components of other comprehensive income as part of the statement of changes in shareholders’ equity. It also requires the presentation on the face of the financial statements reclassification adjustments for items that are reclassified from other comprehensive income to net income in the statement(s) where the components of net income and the components of other comprehensive income are presented. In October 2011, the FASB decided to propose a deferral of the new requirement and issue an exposure draft on the decision. The deferral allows the FASB time to further research the matter, including a proposed requirement to disclose in the notes to the financial statements amounts reclassified out of other comprehensive income. The deferral, if finalized, would not change the other requirements stated above. The deferral would be effective at the same time that the new standard on comprehensive is adopted. ASU 2011-05 is effective for interim and annual reporting periods beginning after December 15, 2011 and should be applied retrospectively. The adoption of ASU 2011-05 will not have a material impact on the Company’s consolidated financial statements.

Note 1. Summary of Significant Accounting Policies

Organization

Aircastle Limited (“Aircastle,” the “Company,” “we,” “us” or “our”) is a Bermuda exempted company that was incorporated on October 29, 2004 by Fortress Investment Group LLC and certain of its affiliates (together, the “Fortress Shareholders” or “Fortress”) under the provisions of Section 14 of the Companies Act of 1981 of Bermuda. Aircastle’s business is investing in aviation assets, including leasing, managing and selling commercial jet aircraft to airlines throughout the world and investing in aircraft related debt investments.

Basis of Presentation

Aircastle is a holding company that conducts its business through subsidiaries. Aircastle directly or indirectly owns all of the outstanding common shares of its subsidiaries. The consolidated financial statements presented are prepared in accordance with U.S. generally accepted accounting principles (“US GAAP”). We operate in a single segment.

The accompanying consolidated financial statements are unaudited and have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial reporting and, in our opinion, reflect all adjustments, including normal recurring items, which are necessary to present fairly the results for interim periods. Operating results for the periods presented are not necessarily indicative of the results that may be expected for the entire year. Certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with US GAAP have been omitted in accordance with the rules and regulations of the SEC; however, we believe that the disclosures are adequate to make information presented not misleading. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2010.

The Company’s management has reviewed and evaluated all events or transactions for potential recognition and/or disclosure since the balance sheet date of September 30, 2011 through the date on which the consolidated financial statements included in this Form 10-Q were issued.

Principles of Consolidation

The consolidated financial statements include the accounts of Aircastle and all of its subsidiaries. Aircastle consolidates eight Variable Interest Entities (“VIEs”) of which Aircastle is the primary beneficiary. All intercompany transactions and balances have been eliminated in consolidation.

We consolidate VIEs in which we have determined that we are the primary beneficiary. We use judgment when deciding (a) whether an entity is subject to consolidation as a VIE, (b) who the variable interest holders are, (c) the potential expected losses and residual returns of the variable interest holders, and (d) which variable interest holder is the primary beneficiary. When determining which enterprise is the primary beneficiary, we consider (1) the entity’s purpose and design, (2) which variable interest holder has the power to direct the activities that most significantly impact the entity’s economic performance, and (3) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. When certain events occur, we reconsider whether we are the primary beneficiary of VIEs. We do not reconsider whether we are a primary beneficiary solely because of operating losses incurred by an entity.

Recent Accounting Pronouncements

In August 2010, the Financial Accounting Standards Board (“FASB”) issued an exposure draft, “Leases” (the “Lease ED”), which would replace the existing guidance in the Accounting Standards Codification (“ASC”) 840 (“ASC 840”), Leases. Under the Lease ED, a lessor would be required to adopt a right-of-use model where the lessor would apply one of two approaches to each lease based on whether the lessor retains exposure to significant risks or benefits associated with the underlying asset. In July 2011, the FASB tentatively decided on a new model for lessor accounting that would require a single approach for all leases, with a few exceptions. Under the new model, a lease receivable would be recognized for the lessor’s right to receive lease payments, a portion of the carrying amount of the underlying asset would be allocated between the right of use granted to the lessee and the lessor’s residual value and profit or loss would only be recognized at commencement if it is reasonably assured. Even though the FASB has not completed all of its deliberations, the decisions made to date were sufficiently different from those published in the Lease ED to warrant re-exposure of the revised proposal. The FASB intends to complete its deliberations and publish a revised proposed leases standard during the first half of 2012. We anticipate that the final standard may have an effective date no earlier than 2016. When and if the proposed guidance becomes effective, it may have a significant impact on the Company’s consolidated financial statements. Although we believe the presentation of our financial statements, and those of our lessees could change, we do not believe the accounting pronouncement will change the fundamental economic reasons for which the airlines lease aircraft. Therefore, we do not believe it will have a material impact on our business.

In May 2011, the FASB issued ASU 2011-04 (“ASU 2011-04”), Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurements and Disclosure Requirements in U.S. GAAP and IFRSs, to improve the comparability of fair value measurements presented and disclosed in financial statements prepared in accordance with U.S. GAAP and IFRS. The amendments in this update change the wording used to describe the requirements in U.S. GAAP for measuring fair value and for disclosing information about fair value measurements which include (1) those that clarify the FASB’s intent about the application of existing fair value measurement and disclosure requirements, and (2) those that change a particular principle or requirement for measuring fair value or for disclosing information about fair value measurement. ASU 2011-04 is effective for interim and annual reporting periods beginning after December 15, 2011. The adoption of ASU 2011-04 will not have a material impact on the Company’s consolidated financial statements.

In June 2011, the FASB issued Accounting Standards Update (“ASU”) 2011-05 (“ASU 2011-05”), Comprehensive Income (Topic 220): Presentation of Comprehensive Income, which gives the option to present the total of comprehensive income either in a single continuous statement of comprehensive net income or in two separate but consecutive statements. In either option, an entity is required to present each component of net income along with total net income, each component of other comprehensive income along with a total for other comprehensive income, and a total amount for comprehensive income. If a two statement approach is used, the statement of other comprehensive income should immediately follow the statement of net income. This update eliminates the option to present the components of other comprehensive income as part of the statement of changes in shareholders’ equity. It also requires the presentation on the face of the financial statements reclassification adjustments for items that are reclassified from other comprehensive income to net income in the statement(s) where the components of net income and the components of other comprehensive income are presented. In October 2011, the FASB decided to propose a deferral of the new requirement and issue an exposure draft on the decision. The deferral allows the FASB time to further research the matter, including a proposed requirement to disclose in the notes to the financial statements amounts reclassified out of other comprehensive income. The deferral, if finalized, would not change the other requirements stated above. The deferral would be effective at the same time that the new standard on comprehensive is adopted. ASU 2011-05 is effective for interim and annual reporting periods beginning after December 15, 2011 and should be applied retrospectively. The adoption of ASU 2011-05 will not have a material impact on the Company’s consolidated financial statements.