| 1 | ADH | Air One | IATA: AP, Callsign: Heron, IATA Prefix: 867, Merged into Alitalia on 30 October 2014. Name changed from Aliadriatica w.e.f. 23 November 1995. | I | AVCODES |
| 2 | ADH | Aliadriatica | IATA: AP, Founded in November 1983. Name changed to Air One w.e.f. 23 November 1995. | I | AVCODES |
| 3 | ADH | Atlantic Deutsche Luftverkehrs AG | IATA: ID, Callsign: German Atlantic, | D | AVCODES |
| 4 | ADH | Air One | IATA: AP | | ICAO1 |
| 5 | ADHA | A & D EXPRESS | | | SCAC4 |
| 6 | ADHE | ASTRA DIVISION/HELMS EXPRESS | | | SCAC3 |
| 7 | ADHF | ADVANTAGE METALS RECYCLING LLC | | | SCAC4 |
| 8 | ADHG | ALLEN, DUANE TRUCKING | | | SCAC4 |
| 9 | ADHH | ARMOIRES DE CUISINE MILMONDE INC | | | SCAC4 |
| 10 | ADHI | ALEXANDER DISPOS-HAUL SYSTEM INC | | | SCAC3 |
| 11 | ADHJ | AIRPORT DELIVERY INC | | | SCAC4 |
| 12 | ADHL | A & D HAULING SERVICES INC | | | SCAC3 |
| 13 | ADHL | A & D HAULING SERVICES INC | | | SCAC4 |
| 14 | ADHM | ACADIA MARINE LLC | | | SCAC4 |
| 15 | ADHN | ADVANCED SHIPPING TECHNOLOGIES | | | SCAC4 |
| 16 | ADHP | ADNOHR INCORPORATED | | | SCAC3 |
| 17 | ADHQ | ADLER SHIPPING LIMITED | | | SCAC3 |
| 18 | ADHQ | ARDMORE SHIPPING LIMITED | | | SCAC4 |
| 19 | ADHS | ADELPHI SALES CO INC | | | SCAC3 |
| 20 | ADHS | ACADIA COACH LINES INC | | | SCAC4 |
| 21 | ADHT | ADVANCED ENERGY LTD | | | SCAC4 |
| 22 | ADHU | ADHOC S.R.L | | I | BIC |
| 23 | ADHW | AMORES, DOUGLAS HEAVY DUTY WRECKER | | | SCAC3 |
| 24 | ADHY | A & D CUSTOM MACHINING & FABRICATIN | | | SCAC4 |
