| 1 | ABR | Air Contractors (Ireland) Limited | IATA: AG, Callsign: Contract, IATA Prefix: 912, Designator AG recalled by IATA. Company transfered from United Kingdom | IRL | AVCODES |
| 2 | ABR | Air Bridge Carriers Ltd. (ABC) | IATA: AK, Callsign: Airbridge, | GB | AVCODES |
| 3 | ABR | Air Contractors (UK) Limited | IATA: AG, Callsign: Contract, IATA Prefix: 912, Company transfered to Ireland. Name changed from Hunting Air Cargo Airlines Ltd. | GB | AVCODES |
| 4 | ABR | Hunting Air Cargo Airlines Ltd. | IATA: AG, Callsign: Contract, Name changed to Air Contractors (UK) Limited | GB | AVCODES |
| 5 | ABR | Air Contractors (Ireland) Limited | Callsign: Contract, IATA Prefix: 912, Name changed to ASL Airlines Ireland Ltd w.e.f. 04 June 2015. Designator AG recalled by IATA. Company transfered from United Kingdom | IRL | AVCODES |
| 6 | ABR | ASL Airlines (Ireland) Limited | Callsign: Contract, IATA Prefix: 912, Name changed from Air Contractors (Ireland) Limited w.e.f. 04 June 2015. Designator AG recalled by IATA. Company transfered from United Kingdom | IRL | AVCODES |
| 7 | ABR | Air Contractors | IATA: AG | | ICAO1 |
| 8 | ABR | The Athens Line, LLC | 7/2005 | | NAKINA |
| 9 | ABR | ATHENS LINES LLC | | | PWRC |
| 10 | ABR | Athens Line | | | RSRV |
| 11 | ABR | ATHENS LINE LLC, THE | | | SCAC4 |
| 12 | ABR | Abellio GmbH | | D | TRAFFIC |
| 13 | ABRA | Arriva Bratislava | | SK | TRAFFIC |
| 14 | ABRB | AMBLER, ROBERT | | | SCAC3 |
| 15 | ABRC | ASBRAND, CHRISTIAN C | | | SCAC3 |
| 16 | ABRD | AGUIRRE BORBOA, RICARDO | | | SCAC4 |
| 17 | ABRF | ABC TRANSFER COMPANY | | | SCAC3 |
| 18 | ABRF | AGUIRRE BARBA, RAFAEL | | | SCAC4 |
| 19 | ABRG | ALTER BARGE LINES INC | | | SCAC3 |
| 20 | ABRH | AMBROSIA SHIPPING INC | | | SCAC4 |
| 21 | ABRI | ABC RELOCATION SERVICES INC | | | SCAC3 |
| 22 | ABRK | ABC TRUCKING | | | SCAC3 |
| 23 | ABRL | ABEAR MOBILE HOMES INC | | | SCAC3 |
| 24 | ABRM | ABRAMS TRUCKING INC | | | SCAC4 |
| 25 | ABRM | Abello Rail Mitteldeutschland GmbH | | DE | VKM |
| 26 | ABRN | Abellio Rail NRW GmbH | Essen | D | privat-bahn.de |
| 27 | ABRN | ALBERTSONS INC | | | SCAC3 |
| 28 | ABRN | Abellio Rail NRW GmbH | | DE | VKM |
| 29 | ABRO | ABROS LEASING CORP | | | SCAC3 |
| 30 | ABRP | ALLBRECHT TRUCKING | | | SCAC3 |
| 31 | ABRQ | A B C RAPID DELIVERY INC | | | SCAC3 |
| 32 | ABRQ | A B C RAPID DELIVERY INC | | | SCAC4 |
| 33 | ABRR | AUTO EXPRESS BARRERA | | | SCAC4 |
| 34 | ABRRS | Road & Rail Service | | DE | VKM |
| 35 | ABRS | ALBERS, WARREN | | | SCAC3 |
| 36 | ABRS | AUTO & BOAT RELOCATION SERVICES LLC | | | SCAC4 |
| 37 | ABRT | AUBRY TRANSPORTATION INC | | | SCAC3 |
| 38 | ABRV | ALBRECT, VICTOR | | | SCAC3 |
| 39 | ABRV | ANDERSON BROTHERS INC | | | SCAC4 |
| 40 | ABRW | ANDERSON, B R & CO. SEATTLE | | | SCAC3 |
| 41 | ABRX | LHSTL Railway Co. | added 7/2008; eliminated 1/2010 | | NAKINA |
| 42 | ABRX | Railmark Holdings Inc. | added 1/2004; eliminated 4/2004; 7/2005 (unlisted) | | NAKINA |
| 43 | ABRX | AB Rail Investments, Inc. | 7/2000 (not listed) | | NAKINA |
| 44 | ABRX | Merchants Despatch Transportation Corp. | 4/1938-4/1947 | | NAKINA |
| 45 | ABRX | Merchants Despatch Transportation Corp. (Abraham Bros. Packing Co.) | 7/1937 | | NAKINA |
| 46 | ABRX | Abraham Bros. Packing Co. | Apr-38 | | NRHS |
| 47 | ABRX | AB Rail Investments, Inc. | Jul-00 | | NRHS |
| 48 | ABRX | *MERCHANTS DESPATCH TRANSPORTATION CORP. (ABRAHAM BROS. PACKING CO.) | | | PWRC |
| 49 | ABRX | *ADRIAN & BLISSFIELD RAILROAD | | | PWRC |
| 50 | ABRX | *AB RAIL INVESTMENTS INC. | | | PWRC |
| 51 | ABRX | *RAILMARK HOLDINGS INC. | | | PWRC |
| 52 | ABRX | +LHSTL RAILWAY CO. | | | PWRC |
| 53 | ABRX | AB Rail Investments (Railmark Holdings) | | | RSRV |
| 54 | ABRX | RAILMARK HOLDINGS INC | | | SCAC4 |
