- Northwest Airlines68
- Western Air Lines, Inc.45
- Delta Air Lines, Inc.32
- Northeast Airlines32
- Southern Airways, Inc.30
- North Central Airlines, Inc.27
- Pacific Northern Airlines, Inc.20
- Chicago and Southern Air Lines13
- Western Air Express Corporation12
- Southwest Airways, Inc.10
- Pacific Air Lines, Inc.7
- Republic Airlines7
- Bonanza Air Lines, Inc.6
- Delta Air Corporation6
- Hughes Air Corp.6
- Wisconsin Central Airlines, Inc.5
- Western Air Express, Inc.3
