Showing 1,012 registered airlines with a combined fleet of 9,649 airframes.
| Airline Name | ICAO / IATA | Fleet Size |
|---|---|---|
| Kalitta Air | CKS / K4 | 39 |
| Kalitta Charters | KFS / K9 | 13 |
| Kalitta Charters II | KII / CB | 7 |
| Kansas State University | KSU | 0 |
| Kavouras Inc | XKA | 0 |
| Kenmore Air | KEN / M5 | 15 |
| Key Airlines | KEY | 1 |
| Key Lime Air | LYM | 20 |
| Keystone Aerial Surveys | FTP | 0 |
| Kingfisher Air Services | BEZ | 5 |