| 1 | HHP | Helenia Helicopter Service ApS | Callsign: Helenia, | DK | AVCODES |
| 2 | HHP | Helenia Helicopter Service | | | ICAO1 |
| 3 | HHPC | HIGH PRESSURE TRANSPORTS LLC | | | SCAC4 |
| 4 | HHPE | HI HO PETROLEUM CT COKE INC | | | SCAC4 |
| 5 | HHPI | Heavy Haul Power International GmbH | Erfurt | D | privat-bahn.de |
| 6 | HHPI | HOOD, H P INC | | | SCAC4 |
| 7 | HHPI | Heavy Haul Power International | | D | TRAFFIC |
| 8 | HHPI | Heavy Haul Power International | | DE | VKM |
| 9 | HHPO | H & H TRANSPORTATION INC | | | SCAC4 |
| 10 | HHPP | HATCHER PETROLEUM TRANSPORT INC | | | SCAC4 |
| 11 | HHPW | HERA SHIPPING & TRADING CO LTD | | | SCAC4 |
