Cover Page - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Feb. 10, 2020
Jun. 30, 2019
Cover page.   
Document Type10-K  
Document Quarterly Reporttrue  
Document Period End DateDec. 31, 2019  
Document Transition Reportfalse  
Entity File Number001-32959  
Entity Registrant NameAIRCASTLE LIMITED  
Entity Incorporation, State or Country CodeD0  
Entity Tax Identification Number98-0444035  
Entity Address, Address Line Onec/o Aircastle Advisor LLC  
Entity Address, Address Line Two201 Tresser Boulevard, Suite 400  
Entity Address, City or TownStamford  
Entity Address, State or ProvinceCT  
City Area Code203  
Local Phone Number504-1020  
Title of Each ClassCommon Shares, par value $0.01 per share  
Trading SymbolAYR  
Name of Each Exchange on Which RegisteredNYSE  
Entity Well-known Seasoned IssuerYes  
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Interactive Data CurrentYes  
Entity Filer CategoryLarge Accelerated Filer  
Entity Small Businessfalse  
Entity Emerging Growth Companyfalse  
Entity Shell Companyfalse  
Entity Public Float  $ 1,100
Entity Common Stock, Shares Outstanding 75,109,023 
Documents Incorporated by Reference [Text Block]
Documents of Which Portions
Are Incorporated by Reference
 
Parts of Form 10-K into Which Portion
Of Documents Are Incorporated
Portions of the Proxy Statement for Aircastle Limited for its 2020 Annual General Meeting of Shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K, provided that if such Proxy Statement is not filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year covered by this Form 10-K, an amendment to this Form 10-K shall be filed no later than the end of such 120-day period.
 
Part III
 
(Items 10, 11, 12, 13 and 14)
  
Entity Central Index Key0001362988  
Amendment Flagfalse  
Document Fiscal Year Focus2019  
Document Fiscal Period FocusFY  
Current Fiscal Year End Date--12-31  
Entity Address, Postal Zip Code06901  

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