| 1 | KEY | Key Airlines | Callsign: Key Air, Name changed to Key Air, LLC. | USA | AVCODES |
| 2 | KEY | Key Air, LLC. | Callsign: Key Air, Name changed from Key Airlines. | USA | AVCODES |
| 3 | KEY | Key Airlines | | | ICAO1 |
| 4 | KEYA | K-E-Y INTERNATIONAL | | | SCAC4 |
| 5 | KEYB | KEYBOARD CARRIAGE, INC | | | SCAC3 |
| 6 | KEYB | KEYBOARD CARRIAGE INC | | | SCAC4 |
| 7 | KEYC | KEY CITY TRANSFER & REFRIGERATOR LI | | | SCAC3 |
| 8 | KEYD | KEY DISTRIBUTORS INC | | | SCAC4 |
| 9 | KEYE | KEYCO MOTOR FREIGHT INC | | | SCAC3 |
| 10 | KEYH | KEYHOLE RANCH | | | SCAC4 |
| 11 | KEYJ | KEY TRANSPORTATION INC | | | SCAC3 |
| 12 | KEYK | KEYSTONE LINES BROKERAGE DIVISION | | | SCAC4 |
| 13 | KEYL | KEYSTONE LINES | | | SCAC3 |
| 14 | KEYL | KEYSTONE LINES | | | SCAC4 |
| 15 | KEYM | KEYMARK CORPORATION | | | SCAC3 |
| 16 | KEYO | KEY MOBILE HOMES | | | SCAC3 |
| 17 | KEYQ | KEYSTONE TERMINALS INC | | | SCAC3 |
| 18 | KEYQ | KEY AGVENTURES INC | | | SCAC4 |
| 19 | KEYR | KEY MOVING STORAGE | | | SCAC3 |
| 20 | KEYS | KEYSTOPS LLC | | | SCAC4 |
| 21 | KEYS | Key System | | US-CA | TRAFFIC |
| 22 | KEYT | KEY TRANSPORTATION INC | | | SCAC4 |
| 23 | KEYU | FASTGROW / KEYUN GROUP | | PRC | BIC |
| 24 | KEYU | GOLD PRIME HOLDINGS LIMITED | | | SCAC4 |
| 25 | KEYV | KEYSTONE SHIPPING COMPANY | | | SCAC3 |
| 26 | KEYV | KEYSTONE SHIPPING CO | | | SCAC4 |
| 27 | KEYW | KEY CARTAGE INC | | | SCAC3 |
| 28 | KEYX | Keywell Corp. | 1/1994 (not listed); 7/2000-7/2005 | | NAKINA |
| 29 | KEYX | Keywell Corp. | 1/94-7/2000 | | NRHS |
| 30 | KEYX | KEYWELL CORPORATION | | | PWRC |
| 31 | KEYX | Keywell Corporation | | | RSRV |
| 32 | KEYX | KEYWELL CORPORATION | | | SCAC4 |
| 33 | KEYY | KEY TRANSPORTATION | | | SCAC3 |
