| 1 | HKR | Hawk Air, S.A. | Callsign: Air Haw, Founded in 1998. Ceased operations during 2006. | RA | AVCODES |
| 2 | HKR | Tower Aviation Management LLC d/b/a A2V | Callsign: Data Bird, | USA | AVCODES |
| 3 | HKR | Hawk Air | | | ICAO1 |
| 4 | HKRA | HOEKSTRA TRANSPORTATION LLC | | | SCAC4 |
| 5 | HKRD | HOEKSTRA DEDICATED (DIV OF HOEKSTRA | | | SCAC4 |
| 6 | HKRE | HINKLEY, R E CO INC | | | SCAC4 |
| 7 | HKREHA | The Hong Kong Society for Rehabilitation | | HK | TRAFFIC |
| 8 | HKRL | HOEKSTRA LOGISTICS LLC | | | SCAC4 |
| 9 | HKRN | HAMELIN, KRISTIN | | | SCAC4 |
