| 1 | AR | Aerolineas Argentinas | ICAO: ARG, Callsign: Argentina, IATA Prefix: 044, | RA | AVCODES |
| 2 | AR | Aberdeen and Rockfish R.R. Co. | 1/1975; added 7/1978; 1/1980-7/2005 | | NAKINA |
| 3 | AR | Aberdeen and Rockfish R.R. Co. | 1/75; added 7/78; 1/80-7/2000 | | NRHS |
| 4 | AR | ABERDEEN & ROCKFISH RAILROAD | | | PWRC |
| 5 | AR | Aberdeen and Rockfish Railroad | | | RSRV |
| 6 | AR | ABERDEEN AND ROCKFISH RAILROAD COMP | | | SCAC4 |
| 7 | AR | Arriva Nederland | Real: AN | NL | TRAFFIC |
| 8 | AR | Anglia Railways Train Services | | UK | VKM |
| 9 | ARA | Aerobeira, Sociedade de Transportes Aereos Lda | Callsign: Aerobeira, | P | AVCODES |
| 10 | ARA | Aurora Air Service, Inc. | Callsign: Aurora, | USA | AVCODES |
| 11 | ARA | Arik Air | IATA: W3, Callsign: Arik Air, IATA Prefix: 725, Operations restarted. Ceased Operations on 20 September 2012. | WAN | AVCODES |
| 12 | ARA | Arik Air | | | ICAO1 |
| 13 | ARA | Arcade & Attica R.R. Corp. | 4/1970; eliminated 11/1973; 1/1975-7/2000; eliminated 1/2005; 7/2005 | | NAKINA |
| 14 | ARA | Arcade & Attica R.R. Corp. | 4/70; eliminated 11/73; 1/75-7/2000 | | NRHS |
| 15 | ARA | ARCADE & ATTICA RAILROAD CORP | | | PWRC |
| 16 | ARA | Arcade and Attica Railroad | | | RSRV |
| 17 | ARA | Arcade & Attica R.R. Corp. | | USA | TRAFFIC |
| 18 | ARAB | ARAB CARTAGE & EXPRESS | | | SCAC3 |
| 19 | ARAB | ARAB CARTAGE & EXPRESS | | | SCAC4 |
| 20 | ARAC | ARCO AUTO CARRIERS, INC | | | SCAC3 |
| 21 | ARAD | A-R-A TRUCKING INC | | | SCAC3 |
| 22 | ARAD | ARA SHOES CANADA INC | | | SCAC4 |
| 23 | ARAD | | City: Arad | RO | TRAFFIC |
| 24 | ARAE | ARNIO, ARNIE M | | | SCAC3 |
| 25 | ARAE | ARPA ENTERPRISES INC | | | SCAC4 |
| 26 | ARAF | AMERPOLE AIR FREIGHT | | | SCAC3 |
| 27 | ARAF | ARK VALLEY OIL COMPANY LLC | | | SCAC4 |
| 28 | ARAG | ARAGO TRUCKING | | | SCAC4 |
| 29 | ARAH | ARMTEC | | | SCAC4 |
| 30 | ARAIL | Aarsleff Rail A/S | | DK | VKM |
| 31 | ARAJ | ARA TRANSPORTATION INC | | | SCAC3 |
| 32 | ARAJ | ARAUJO GARZA, INDALECIO | | | SCAC4 |
| 33 | ARAK | ARA TRUCKING CORP | | | SCAC3 |
| 34 | ARAK | ARAKELIAN ENTERPRISES | | | SCAC4 |
| 35 | ARAL | ARABIAN STEAMSHIP LINES | | | PWRC |
| 36 | ARAL | A & L TRUCKING | | | SCAC3 |
| 37 | ARAM | ARABIAN SHIPPERS | | | PWRC |
| 38 | ARAMIS | Przewóz Osób i Towarów Firma Aramis, Dariusz Armatys | | PL | TRAFFIC |
| 39 | ARAO | ARA TRANSPORTATION GROUP | | | SCAC3 |
| 40 | ARAP | ARAPAHOE PIPE LINE COMPANY | | | SCAC3 |
| 41 | ARAQ | ARRIOLA TRUCKING | | | SCAC3 |
| 42 | ARAQ | ARMENDARIZ, JOSE TRUCKING | | | SCAC4 |
| 43 | ARAR | ARCHER AND ARCHER, INC | | | SCAC3 |
| 44 | ARAT | ARCADIA TRANSPORTATION COMPANY | | | SCAC3 |
| 45 | ARAT | AUTO TRANSPORTES FRAJARA | | | SCAC4 |
| 46 | ARAU | ARA F&D | | ROK | BIC |
| 47 | ARAU | ALEXANDRIA SHIPPING & NAVIGATION CO | | | SCAC3 |
| 48 | ARAV | ARAMBEL, JOHN TRUCKING INC | | | SCAC4 |
| 49 | ARAW | ARROW AIR INC | | | SCAC3 |
| 50 | ARAW | ARNOFF MOVING & STORAGE OF ALBANY I | | | SCAC4 |
| 51 | ARAY | ARA TRANSPORTATION INC | | | SCAC3 |
| 52 | ARAY | ARCO LOGISTICS INC | | | SCAC4 |
| 53 | ARB | Avia Air N.V. | IATA: 3R, Callsign: Aviair, Ceased operations. IATA designator changed from 8R* | ARU | AVCODES |
| 54 | ARB | Arubair | | ARU | AVCODES |
| 55 | ARB | AirBahn, Inc. | Callsign: Airbahn, | USA | AVCODES |
| 56 | ARB | Avia Air N.V. | | | ICAO1 |
| 57 | ARBA | AMERICAN RED BALL INTERNATIONAL INC | | | SCAC3 |
| 58 | ARBB | ANGEL RRV BUS LINE INC | | | SCAC3 |
| 59 | ARBB | ARVI BASSES | | | SCAC4 |
| 60 | ARBC | AMERICAN RUBBER PRODUCTS CORP | | | SCAC3 |
| 61 | ARBD | APTI | | | SCAC4 |
| 62 | ARBE | ARBE TRANSFER CO INC | | | SCAC3 |
| 63 | ARBED | Aciéries Réunies de Burbach-Eich-Dudelange | | L | TRAFFIC |
| 64 | ARBF | AIRBORNE FORWARDING CORPORATION | | | SCAC3 |
| 65 | ARBF | ARIZONA OUTBACK ADVENTURES | | | SCAC4 |
| 66 | ARBGI | Arbegui s.a. | | ES | VKM |
| 67 | ARBH | ARNOLD, BERT | | | SCAC3 |
| 68 | ARBK | ARAB MARITIME PETROLEUM TRANSPORT | | | SCAC3 |
| 69 | ARBK | ARROWHEAD TRANSPORTATION SERVICES I | | | SCAC4 |
| 70 | ARBL | ARMBRO TRANSPORT LTD | | | SCAC3 |
| 71 | ARBL | ARMBRO TRANSPORT INC | | | SCAC4 |
| 72 | ARBN | ARTUROS TRANSFER | | | SCAC4 |
| 73 | ARBO | ARBOR FREIGHT SERVICE INC | | | SCAC3 |
| 74 | ARBP | ARBALLO TRANSPORTATION INC | | | SCAC3 |
| 75 | ARBQ | ANDERSON, ROBERT ALDEN | | | SCAC3 |
| 76 | ARBQ | ART LOGISTICS INC | | | SCAC4 |
| 77 | ARBR | A R B INC | | | SCAC4 |
| 78 | ARBR | Rail ARB s.r.o | | SK | VKM |
| 79 | ARBS | ARMOR BUILDING SUPPLY | | | SCAC4 |
| 80 | ARBT | ARBET ASSEMBLY AND DISTRIBUTING SER | | | SCAC3 |
| 81 | ARBTP | Arriva Bus Transport Polska | | PL | TRAFFIC |
| 82 | ARBW | A RELIABLE TRUCKING & WAREHOUSE CO | | | SCAC3 |
| 83 | ARBW | ARBEC TOOL & MACHINE LTD | | | SCAC4 |
| 84 | ARBX | Arnold Bros. Pickle & Preserve Co. | 7/1930 | | NAKINA |
| 85 | ARBX | ARNOLD BROTHERS PICKLE & PRESERVE CO. | | | PWRC |
| 86 | ARC | Air Routing International Corp. | IATA: ZJ, Name changed to Air Routing International LP | USA | AVCODES |
| 87 | ARC | Air Routing International Corp. | IATA: XC, | USA | AVCODES |
| 88 | ARC | Air Routing International L.P. | IATA: ZJ, Name changed from Air Routing International Corp. | USA | AVCODES |
| 89 | ARC | Air Routing International Corp. | | | ICAO1 |
| 90 | ARC | Alexander R.R. Co. | 1/1975-7/2005 | | NAKINA |
| 91 | ARC | Alexander R.R. Co. | 1/75-7/2000 | | NRHS |
| 92 | ARC | ALEXANDER RAILROAD CO. | | | PWRC |
| 93 | ARC | Alexander Railroad | | | RSRV |
| 94 | ARC | Amey Roadstone Corporation | | GB | TRAFFIC |
| 95 | ARC | Aqaba Railway Corporation | | JO | VKM |
| 96 | ARCA | ACE RELOCATION SYSTEMS INC | | | SCAC4 |
| 97 | ARCB | AROMATIC TRUCKING CORP | | | SCAC3 |
| 98 | ARCC | ARNCO TRANSPORTATION INC | | | SCAC4 |
| 99 | ARCD | ARCADIA VAN LINES | | | SCAC3 |
| 100 | ARCE | ARAB CARTAGE & EXPRESS CO INC | | | SCAC4 |
