| 1 | HAK | Harka Air Services Nig. Ltd. | Callsign: Harkair Services, | WAN | AVCODES |
| 2 | HAK | Pegasus Helicopters AS | Callsign: Helihawk, ICAO callsign changed to Helifalcon | N | AVCODES |
| 3 | HAK | Pegasus Helicopters AS | Callsign: Helifalcon, ICAO callsign changed from Helihawk | N | AVCODES |
| 4 | HAK | Pegasus Helicopters | | | ICAO1 |
| 5 | HAKI | H & A TRUCKING | | | SCAC4 |
| 6 | HAKM | HAKME | | | SCAC4 |
| 7 | HAKN | HART TRUCKING | | | SCAC4 |
| 8 | HAKU | CARU CONTAINERS BV | | NL | BIC |
| 9 | HAKU | CONTAINER COMPANY AMSTERDAM B.V. | | | SCAC3 |
| 10 | HAKU | CONTAINER COMPANY AMSTERDAM BV | | | SCAC4 |
| 11 | HAKY | HAWKEY TRANSPORTATION, INC | | | SCAC1 |
| 12 | HAKY | HAWKEY TRANSPORTATION, INC | | | SCAC4 |
