| 1 | HDC | Helicopteros de Cataluna, S.A. | Callsign: Helicataluna, | E | AVCODES |
| 2 | HDC | Helcopteros De Cataluna | | | ICAO1 |
| 3 | HDCM | HURTADO CRUZ, MIGUEL | | | SCAC4 |
| 4 | HDCN | HUDD TRANSPORTATION | | | SCAC4 |
| 5 | HDCO | H DANTAS COMERCIO NAVEGACAO E INDUS | | | SCAC4 |
| 6 | HDCR | HILLSDALE COUNTY RAILWAY | | | PWRC |
| 7 | HDCR | HAPPY D CORPORATION | | | SCAC4 |
| 8 | HDCW | HOLMAN DISTRIBUTION CENTER OF WASHINGTON, INC | | | SCAC1 |
| 9 | HDCW | HOLMAN TRANSPORTATION LLC | | | SCAC4 |
| 10 | HDCX | The Hull Corp. | 1/1994 (not listed) | | NAKINA |
| 11 | HDCX | The Hull Corp. | Jan-94 | | NRHS |
| 12 | HDCX | THE HULL CORPORATION | | | PWRC |
