Showing 1,012 registered airlines with a combined fleet of 8,801 airframes.
| Airline Name | ICAO / IATA | Fleet Size |
|---|---|---|
| Kalitta Air | CKS / K4 | 38 |
| Kalitta Charters | KFS / K9 | 10 |
| Kalitta Charters II | KII / CB | 5 |
| Kansas State University | KSU | 0 |
| Kavouras Inc | XKA | 0 |
| Kenmore Air | KEN / M5 | 11 |
| Key Airlines | KEY | 1 |
| Key Lime Air | LYM | 18 |
| Keystone Aerial Surveys | FTP | 0 |
| Kingfisher Air Services | BEZ | 0 |