| 1 | ARR | Aerora, S.A. | Callsign: Aerora, | MEX | AVCODES |
| 2 | ARR | Air Armenia CJSC | IATA: QN, Callsign: Air Armenia, IATA Prefix: 907, Ceased operations on 29 October 2014. | AM | AVCODES |
| 3 | ARR | Air Armenia | IATA: QN | | ICAO1 |
| 4 | ARR | Alaska R.R. Corp. | added 4/1985; 1/1994-7/2005 | | NAKINA |
| 5 | ARR | Alaska R.R. | 7/1965-1/1980; eliminated 4/1985 | | NAKINA |
| 6 | ARR | Alaska R.R. | 7/65-1/80; eliminated 4/85 | | NRHS |
| 7 | ARR | Alaska R.R. Corp. | added 4/85; 1/94-7/2000 | | NRHS |
| 8 | ARR | ALASKA RAILROAD CORPORATION | | | PWRC |
| 9 | ARR | Alaska Railroad | | | RSRV |
| 10 | ARR | Alaska Railroad | | | RSRV |
| 11 | ARR | Alaska Railroad | | USA | TRAFFIC |
| 12 | ARR | ARRIVA vlaky s.r.o. | | CZ | VKM |
| 13 | ARRB | ARNETT, ROBERT TRUCKING | | | SCAC3 |
| 14 | ARRC | ALABAMA ROADRUNNER INC | | | SCAC3 |
| 15 | ARRD | ARCTIC ROADRUNNER TOWING | | | SCAC3 |
| 16 | ARRE | ARREDONDO, G, TRANSFER CO | | | SCAC3 |
| 17 | ARRF | ARMADA REEFERS 3100 AA SCHIEDAM NL | | | SCAC3 |
| 18 | ARRG | Altra R.R. Co. | added 10/1985; eliminated 10/1989 | | NAKINA |
| 19 | ARRG | Altra R.R. Co. | eliminated 10/89 | | NRHS |
| 20 | ARRG | ALTRA RAILROAD | | | PWRC |
| 21 | ARRG | Altra Railroad | | | RSRV |
| 22 | ARRG | ALTRA RAILROAD CO | | | SCAC3 |
| 23 | ARRG | ARREGUIN, ALFREDO TRUCKING SERVICE/ | | | SCAC4 |
| 24 | ARRH | ARR CORPORATION | | | SCAC3 |
| 25 | ARRH | ARR CORPORATION | | | SCAC4 |
| 26 | ARRI | ARROW TRANSFER AND STORAGE INC | | | SCAC3 |
| 27 | ARRIVA | Arriva Tog | 2003 - | DK | jernbanen.dk |
| 28 | ARRIVA | | City: London | GB | TRAFFIC |
| 29 | ARRJ | ATLANTIC RO-RO CARRIERS INC | | | SCAC4 |
| 30 | ARRK | ARROW TRANSFER COMPANY | | | SCAC3 |
| 31 | ARRL | ARROW TRUCK LINES INC | | | SCAC3 |
| 32 | ARRL | ARROW LINES TRANSPORT INC | | | SCAC4 |
| 33 | ARRM | ARROW MOVING & STORAGE COMPANY | | | SCAC3 |
| 34 | ARRN | ARROW SERVICE (A DIV OF HOEGH/UGLAND AUTO LIN | | | SCAC3 |
| 35 | ARRNE | Arriva North East | | GB | TRAFFIC |
| 36 | ARRNR | Arriva Nitra | | SK | TRAFFIC |
| 37 | ARRNZ | ARRIVA Nové Zámky | | SK | TRAFFIC |
| 38 | ARRO | ARROW MOVING & STORAGE | | | SCAC3 |
| 39 | ARRO | AUTO TRANSPORTES DEL ARROYO | | | SCAC4 |
| 40 | ARROW | Arrow Motor Coach Inc. | | USA | TRAFFIC |
| 41 | ARRQ | ARROW MOVING & STORAGE INC | | | SCAC3 |
| 42 | ARRR | ARAN TRANSPORTATION CO INC | | | SCAC3 |
| 43 | ARRS | ARROW TRANSPORTATION SYSTEMS LTD | | | SCAC3 |
| 44 | ARRS | ARRSA TRANSPORT | | | SCAC4 |
| 45 | ARRS | Arriva Sverige AB | | S | TRAFFIC |
| 46 | ARRT | ARROWHEAD TRANSPORTATION | | | SCAC3 |
| 47 | ARRTEP | Arriva Teplice s.r.o. | City: Tepliece | CZ | TRAFFIC |
| 48 | ARRTRN | Arriva Trnava | | SK | TRAFFIC |
| 49 | ARRU | ARGON ISOTANK LTD | | | SCAC4 |
| 50 | ARRV | ARROW VAN LINES INC | | | SCAC3 |
| 51 | ARRW | ARROW MESSENGER SERVICE INC | | | SCAC3 |
| 52 | ARRX | Anthracite Railroads Historical Society, Inc. | 7/2005 (not listed) | | NAKINA |
| 53 | ARRX | Anaconda Minerals Co.—Division of Atlantic Richfield Co. | added 7/1982; eliminated 4/1988 | | NAKINA |
| 54 | ARRX | Arco Coal Co.—Division of Atlantic Richfield Co. | added 7/1979; 1/1980; eliminated 7/1982 | | NAKINA |
| 55 | ARRX | Arrow Refining Co. (Harvey Crude Oil Co.) | 8/1920 | | NAKINA |
| 56 | ARRX | Arco Coal Co.--Division of Atlantic Richfield Co. | added 7/79; 1/80; eliminated 7/82 | | NRHS |
| 57 | ARRX | Anaconda Minerals Co.--Division of Atlantic Richfield Co. | added 7/82; eliminated 4/88 | | NRHS |
| 58 | ARRX | *ARROW REFINING CO. (HARVEY CRUDE OIL CO.) | | | PWRC |
| 59 | ARRX | *ANACONDA MINERALS CO. [ARCO COAL CO. DIV. ATLANTIC RICHFIELD CO.] (ELIMINATED 4/1988) | | | PWRC |
| 60 | ARRX | +ANTHRACITE RAILROADS HISTORICAL SOCIETY | | | PWRC |
| 61 | ARRX | Anthracite Railroads Historical Society | | | RSRV |
| 62 | ARRX | ANTHRACITE RAILROADS HISTORICAL SOC | | | SCAC4 |
| 63 | ARRY | ARROYO TRUCKING INC | | | SCAC3 |
| 64 | ARRY | ARRENDADORA Y TRANSPORTADORA BERNAL | | | SCAC4 |
| 65 | ARRY | Arriva Yorkshire | | GB | TRAFFIC |
