| 12801 | ARSX | Aristech Chemical Corp. | 1/1994-7/2000; eliminated 4/2002 | | NAKINA |
| 12802 | ARSX | Shippers' Car Line Division, ACF Industries Inc. | added 1/1976; 1/1980 | | NAKINA |
| 12803 | ARSX | Shippers' Car Line Division of ACF Industries Inc. | added 7/1956; 10/1957-1/1975; eliminated 1/1976 | | NAKINA |
| 12804 | ARSX | Shippers' Car Line Corp. | added 10/1955; eliminated 7/1956 | | NAKINA |
| 12805 | ARSX | American Radiator & Standard Sanitary Corp. | 1/1941-4/1947 | | NAKINA |
| 12806 | ARSX | Shippers' Car Line Corp. | eliminated 7/56 | | NRHS |
| 12807 | ARSX | Shippers' Car Line Division of ACF Industries Inc. | added 7/56; 10/57-1/80 | | NRHS |
| 12808 | ARSX | Aristech Chemical Corp. | 1/94-7/2000 | | NRHS |
| 12809 | ARSX | *AMERICAN RADIATOR & STANDARD SANITARY CORP. | | | PWRC |
| 12810 | ARSX | +SUNOCO, iNC. (ARISTECH CHEMICAL CORP.) | | | PWRC |
| 12811 | ARSX | *SHIPPERS' CAR LINE DIV. ACF INDUSTRIES, INC. | | | PWRC |
| 12812 | ARSX | +SUNOCO, INC. (ARISTECH CHEMICAL CORP.) | | | PWRC |
| 12813 | ARSX | Aristech Chemical Corporation (Sunoco) | | | RSRV |
| 12814 | ARSX | SUNOCO INC (R & M) | | | SCAC4 |
| 12815 | ARSY | ARCHER SERVICES INC | | | SCAC3 |
| 12816 | ARSY | ACE RELOCATION SYSTEMS INC OF TX | | | SCAC4 |
| 12817 | ART | Aerotal Aerolineas Territoriales de Colombia Ltda | Callsign: Aerotal, Founded in 1970. Ceased operations during 1983. | CO | AVCODES |
| 12818 | ART | Smartlynx Airlines, SIA | IATA: 6Y, Callsign: Smart Lynx, ICAO Designator changed from LTC. ICAO callsign changed from Latcharter. Name changed from Latcharter | LV | AVCODES |
| 12819 | ART | Aerotal Aerolineas Territoriales de Colombia Ltda | | | ICAO1 |
| 12820 | ART | American Refrigerator Transit Co. | 7/1935-1/1975; eliminated 1/1976; 1/1980-7/2005 | | NAKINA |
| 12821 | ART | American Refrigerator Transit Co. | 4/38-7/2000 | | NRHS |
| 12822 | ART | AMERICAN REFRIGERATOR TRANSIT CO. | | | PWRC |
| 12823 | ART | American Refrigerator Transit | | | RSRV |
| 12824 | ART | American Refrigerator Transit Company | The American Refrigerator Transit Company (ART) was a St. Louis, Missouri-based private refrigerator car line established in 1881 by the Missouri Pacific and Wabash railroads. It is now a subsidiary of the Union Pacific Corporation. | USA | TRAFFIC |
| 12825 | ARTA | ARTS SERVICE INC | | | SCAC3 |
| 12826 | ARTB | ARROW TRANSPORTATION | | | SCAC3 |
| 12827 | ARTC | ARLEDGE TRANSFER INC | | | SCAC3 |
| 12828 | ARTD | A | | | SCAC4 |
| 12829 | ARTF | ARROW TRANSFER | | | SCAC3 |
| 12830 | ARTH | ARTS MOBILEHOMES TRANSPORT INC | | | SCAC3 |
| 12831 | ARTH | ARTHUR, W G INC | | | SCAC4 |
| 12832 | ARTI | ARROW TRANSPORTATION CO INC | | | SCAC3 |
| 12833 | ARTI | ARTES IMPORTS INC | | | SCAC4 |
| 12834 | ARTK | ARTUS TRUCKING CO | | | SCAC3 |
| 12835 | ARTL | ARCHBOLD TRUCK LINE, INC | | | SCAC3 |
| 12836 | ARTL | ARNONE TRANSPORT LIMITED | | | SCAC4 |
| 12837 | ARTM | ARTIM TRANSPORT INC | | | SCAC3 |
| 12838 | ARTM | ARMSTRONG RELOCATION MONTGOMERY LLC | | | SCAC4 |
| 12839 | ARTN | AURORA TRUCKING INC | | | SCAC3 |
| 12840 | ARTO | ARTERIAL TRANSPORT CORPORATION | | | SCAC3 |
| 12841 | ARTO | ARTERIAL TRANSPORT CORPORATION | | | SCAC4 |
| 12842 | ARTOG | Arriva Tog | 2003 - | DK | TRAFFIC |
| 12843 | ARTP | ARNETT TRUCKING | | | SCAC3 |
| 12844 | ARTP | ARNDT, PAUL | | | SCAC4 |
| 12845 | ARTQ | ART STORAGE & TRANSFER CO | | | SCAC3 |
| 12846 | ARTR | AMERITRANS INC | | | SCAC3 |
| 12847 | ARTS | ACE REFRIGERATED TRUCKING SERVICE | | | SCAC3 |
| 12848 | ARTS | Anglia Railways Train Services Ltd. | Real: AR, 1999: 614km standard gauge, electrified at 25kV 50Hz Anglia Railways was a British train operating company, owned by GB Railways, which between 5 January 1997 and 31 March 2004 operated mainline trains out of London Liverpool Street station and a number of local rail services in East Anglia. On April 1, 2004 its franchise was transferred to Train Operating Company London Eastern Railway Ltd, which is a subsidiary of the National Express Group. Its services are branded 'one'. | GB | TRAFFIC |
| 12849 | ARTT | AMERICA-RUSSIA-TURKEY OCEAN NAVIGAT | | | SCAC3 |
| 12850 | ARTT | AMERICA-RUSSIA-TURKEY OCEAN NAVIGAT | | | SCAC4 |
| 12851 | ARTU | CARU CONTAINERS BV | | NL | BIC |
| 12852 | ARTU | CATU CONTAINERS S.A. | | | PWRC |
| 12853 | ARTU | CARU Containers | | | RSRV |
| 12854 | ARTU | CATU CONTAINERS S.A. | | | SCAC3 |
| 12855 | ARTU | CONTAINER ASSOCIATION ROTTERDAM BV | | | SCAC4 |
| 12856 | ARTV | ARROW TRANSFER AND STORAGE COMPANY | | | SCAC3 |
| 12857 | ARTW | ARROW TOWING SERVICE | | | SCAC3 |
| 12858 | ARTX | American Refrigerator Transit Co. | 7/1932-4/1947 | | NAKINA |
| 12859 | ARTX | American Refrigerator Transit Co. | Apr-38 | | NRHS |
| 12860 | ARTX | *AMERICAN REFRIGERATOR TRANSIT CO. | | | PWRC |
| 12861 | ARTX | *ARTRAIN | | | PWRC |
| 12862 | ARTY | ARTS TRANSFER & STORAGE CO | | | SCAC3 |
| 12863 | ARU | Air Aruba N.V. | IATA: FQ, Callsign: Aruba, Ceased operations on 23 October 2000. | ARU | AVCODES |
| 12864 | ARU | Arubaanse Luchtvaart Maatschappij N.V dba Aruba Airlines | IATA: AG, Callsign: Aruba, IATA Prefix: 209, IATA Accounting and Prefix codes recalled. IATA Prefix code reinstated. | ARU | AVCODES |
| 12865 | ARU | Arubaanse Luchtvaart Maatschappij N.V dba Aruba Airlines | IATA: AG, Callsign: Aruba, IATA Prefix: 209, IATA Accounting and Prefix codes recalled. | ARU | AVCODES |
| 12866 | ARUA | ARL TRANSPORTATION LLC | | | SCAC4 |
| 12867 | ARUB | ARUBA BONAIRE CURACAO LINER ASSO | | | SCAC3 |
| 12868 | ARUC | A & R TRUCKING INC | | | SCAC3 |
| 12869 | ARUE | AIRPORT LIMOUSINE INC | | | SCAC3 |
| 12870 | ARUE | ALVERO TRUCKING INC | | | SCAC4 |
| 12871 | ARUF | ARROYO TRUCKING | | | SCAC4 |
| 12872 | ARUH | ARNOLD TRUCKING | | | SCAC4 |
| 12873 | ARUK | A & R TRANSPORT INC | | | SCAC3 |
| 12874 | ARUL | ACOSTA, RAUL | | | SCAC3 |
| 12875 | ARUL | ALL ROUTES LOGISTICS INC | | | SCAC4 |
| 12876 | ARUO | ARTHURS OIL CO INC | | | SCAC4 |
| 12877 | ARUP | AUTO ROUND UP, THE | | | SCAC4 |
| 12878 | ARUR | ARMBRUSTER, STEVEN L | | | SCAC3 |
| 12879 | ARUR | ARUR TRANSPORT LTD | | | SCAC4 |
| 12880 | ARUS | AREA BUS CORP | | | SCAC3 |
| 12881 | ARUS | ARGUS LOGISTICS | | | SCAC4 |
| 12882 | ARV | Aravco Ltd. | Callsign: Aravco, | GB | AVCODES |
| 12883 | ARV | Aravco Ltd. | | | ICAO1 |
| 12884 | ARVA | ARVADA-GLOBE TRUCKING, INC | | | SCAC3 |
| 12885 | ARVA | ARVADA-GLOBE TRUCKING INC | | | SCAC4 |
| 12886 | ARVB | ASLINS AMERICAN MOVERS INC | | | SCAC4 |
| 12887 | ARVC | ADVANTAGE RV HAULING INC | | | SCAC4 |
| 12888 | ARVD | ARVEN FREIGHT FORWARDING INC | | | SCAC4 |
| 12889 | ARVE | AERO-VENTURE INC | | | SCAC3 |
| 12890 | ARVEDI | Arvedi Acciaieria (Steel works) | | I | TRAFFIC |
| 12891 | ARVH | ARVCO INC | | | SCAC3 |
| 12892 | ARVI | AROOSTOOK VAN LINES INC | | | SCAC3 |
| 12893 | ARVK | ANDERSON, R V TRUCKING | | | SCAC3 |
| 12894 | ARVL | ARROW VAN LINES | | | SCAC3 |
| 12895 | ARVM | ACO ROAD SERVICE LLC | | | SCAC4 |
| 12896 | ARVN | AIR VAN INC | | | SCAC3 |
| 12897 | ARVN | ARUNDEL, DANIEL | | | SCAC4 |
| 12898 | ARVO | ARVO, LYLY & SONS | | | SCAC3 |
| 12899 | ARVQ | AIRLINE VANS OF TEXAS INC | | | SCAC3 |
| 12900 | ARVR | ATLAS RELOCATION SERVICES INC | | | SCAC4 |
