* Headquarters: Boston, Massachusetts, United States
* Founded: 1892
* Products: Aircraft engines, jet engines, turboshaft engines, turboprop engines, turboramjet engines
Rolls-Royce
* Headquarters: London, United Kingdom
* Founded: 1904
* Products: Aircraft engines, marine propulsion systems, power systems, nuclear reactors
Pratt & Whitney
* Headquarters: East Hartford, Connecticut, United States
* Founded: 1925
* Products: Aircraft engines, space propulsion systems, gas turbines, rocket engines
Snecma
* Headquarters: Courcouronnes, France
* Founded: 1945
* Products: Aircraft engines, space propulsion systems, rocket engines, marine propulsion systems
MTU Aero Engines
* Headquarters: Munich, Germany
* Founded: 1934
* Products: Aircraft engines, industrial gas turbines, marine propulsion systems
