| 1 | HLD | Holiday Air | IATA: HW, Callsign: Holiday Express, Ceased operations | TR | AVCODES |
| 2 | HLD | Grampian Flight Centre Ltd. | Callsign: Granite, | GB | AVCODES |
| 3 | HLD | Grampian Flight Centre | | | ICAO1 |
| 4 | HLDA | HIGHLAND TRANSPORTATON GROUP LLC | | | SCAC4 |
| 5 | HLDB | HILDEBRANDT, GEORGE, INC | | | SCAC4 |
| 6 | HLDC | HOLLAND COMPANY INC | | | SCAC4 |
| 7 | HLDD | HOLIDAY TOURS INC | | | SCAC4 |
| 8 | HLDG | HEARTLAND TRUCKING | | | SCAC4 |
| 9 | HLDI | HOLLAND, DONALD TRUCKING INC | | | SCAC4 |
| 10 | HLDL | HEARTLAND TRANSPORT LLC | | | SCAC4 |
| 11 | HLDN | HILDEBRAND, AL TRUCKING LTD | | | SCAC4 |
| 12 | HLDS | HOTLINE DELIVERY SYSTEMS | | | SCAC4 |
| 13 | HLDT | HIGHLAND TRANSPORT INC | | | SCAC4 |
| 14 | HLDV | HALL, DAVID | | | SCAC4 |
| 15 | HLDW | HAKAI LODGE INC | | | SCAC4 |
| 16 | HLDY | HOLIDAY TRUCKING | | | SCAC4 |
