Aircastle Limited, through its subsidiaries, engages in the acquisition, lease, and sale of high-utility commercial jet aircraft to passenger and cargo airlines worldwide. The company also makes investments in various aviation assets, including debt investments secured by commercial jet aircraft. As of December 31, 2010, its portfolio consisted of 136 aircrafts that were leased to 64 lessees located in 36 countries, and managed through offices in the United States, Ireland, and Singapore. The company was formerly known as Aircastle Investment Limited. Aircastle Limited was founded in 2004 and is based in Stamford, Connecticut.