?- Lufthansa Technik
- Rolls-Royce Holding PLC
- Raytheon Technologies Corporation
- General Electric Company
- Safran SA
- Singapore Technologies Engineering Ltd
- Delta Air Lines Inc.
- Hong Kong Aircraft Engineering Company Limited (HAECO)
- MTU Aero Engines AG
- Textron Inc.
- Honeywell International Inc.
- Israel Aerospace Industries Ltd
- S7 Technics
- SR Technics Switzerland Ltd