- Northwest Airlines69
- Western Air Lines, Inc.45
- Delta Air Lines, Inc.33
- Northeast Airlines33
- Southern Airways, Inc.31
- North Central Airlines, Inc.28
- Pacific Northern Airlines, Inc.21
- Chicago and Southern Air Lines14
- Western Air Express Corporation13
- Southwest Airways, Inc.10
- Republic Airlines8
- Delta Air Corporation7
- Pacific Air Lines, Inc.7
- Bonanza Air Lines, Inc.6
- Hughes Air Corp.6
- Wisconsin Central Airlines, Inc.5
- Western Air Express, Inc.4
