GE Aviation (U.S.)
Rolls-Royce (U.K.)
Pratt & Whitney (U.S.)
Lufthansa Technik (Germany)
Safran Aircraft Engines (Paris)
SIA Engineering Company (Singapore)
Air France Industries KLM Engineering & Maintenance (France)
MTU Aero Engines (Germany)
ST Aerospace (Singapore) and Delta TechOps (U.S.)