The Hong Kong Aircraft Engineering Company Limited (HAECO) is a major aircraft maintenance company in Asia, and has related operations in mainland China and Singapore. Swire Group and Cathay Pacific Airways have major investments in HAECO, which also owns 45 per cent of Aero Engine Services Ltd (HAESL), a joint venture with Rolls-Royce and SIA Engineering of Singapore, providing overhaul service of Rolls-Royce RB211 and Rolls-Royce Trent 500, 700 & 800 series jet engines.