| Document and Entity Information | Mar. 06, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 6, 2020 |
| Entity Registrant Name | Aircastle LTD |
| Entity Incorporation, State or Country Code | D0 |
| Entity File Number | 001-32959 |
| Entity Tax Identification Number | 98-0444035 |
| Entity Address, Address Line One | C/O AIRCASTLE ADVISOR LLC |
| Entity Address, Address Line Two | 201 TRESSER BLVD, SUITE 400 |
| Entity Address, City or Town | STAMFORD |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06901 |
| City Area Code | 203 |
| Local Phone Number | 504-1020 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001362988 |
| Title of 12(b) Security | Common Shares, par value $0.01 per share |
| Trading Symbol | AYR |
| Security Exchange Name | NYSE |
