| 13001 | ARZ | Azurair GmbH | Callsign: Blue Eagle, Commenced operations on 03 July 2017. Ceased operations on 26 September 2018. | D | AVCODES |
| 13002 | ARZ | Airborne Imaging, Inc. | Callsign: Airborne, | USA | AVCODES |
| 13003 | ARZ | Air Resorts | | | ICAO1 |
| 13004 | ARZ | AMERICAN MAIZE | | | PWRC |
| 13005 | ARZC | Arizona & California R.R. Co. | added 10/1991; 1/1994; added 4/1994; 7/2000-7/2005 | | NAKINA |
| 13006 | ARZC | Arizona & California R.R. Co. | added 10/91; 1/94; added 4/94; 7/2000 | | NRHS |
| 13007 | ARZC | ARIZONA & CALIFORNIA RAILROAD COMPANY | | | PWRC |
| 13008 | ARZC | Arizona and California Railroad | | | RSRV |
| 13009 | ARZC | Arizona and California Railroad | | | RSRV |
| 13010 | ARZC | ARIZONA & CALIFORNIA RAILROAD CO | | | SCAC3 |
| 13011 | ARZC | ARIZONA & CALIFORNIA RAILROAD CO | | | SCAC4 |
| 13012 | ARZC | Arizona & California Railroad Company | | USA | TRAFFIC |
| 13013 | ARZD | ARC INDUSTRIES | | | SCAC4 |
| 13014 | ARZH | ARCTIC RUNNER SHIPPING ULC | | | SCAC4 |
| 13015 | ARZL | ARIZONA TANK LINES INC | | | SCAC3 |
| 13016 | ARZP | ARIZPE BENAVIDES, CARLOS GILBERTO | | | SCAC4 |
| 13017 | ARZR | ARIZONA ROLL-OFFS LLC | | | SCAC4 |
| 13018 | ARZS | ANTARCTICA SHIPPING CO LTD PIRAEUS | | | SCAC3 |
| 13019 | ARZS | ARNEZS TRUCKING LLC | | | SCAC4 |
| 13020 | ARZT | ARIZONA TRUCKING COMPANY | | | SCAC3 |
| 13021 | ARZT | ANDERSONS, RL SPECIALIZED TRANSPORT | | | SCAC4 |
| 13022 | ARZT | Arzt Reisen | | D | TRAFFIC |
| 13023 | AS | Alaska Airlines, Inc. | ICAO: ASA, Callsign: Alaska, IATA Prefix: 027, | USA | AVCODES |
| 13024 | AS | Abilene & Southern Ry. Co. | 10/1957-1/1975 | | NAKINA |
| 13025 | AS | Abilene & Southern Ry. Co. | 10/57-1/75 | | NRHS |
| 13026 | AS | MISSOURI PACIFIC [ABILENE & SOUTHERN RWY.] (ELIMINATED 1/1979) | | | PWRC |
| 13027 | AS | Abilene and Southern Railway (Missouri Pacific Railroad) | | | RSRV |
| 13028 | AS | Alexander Schröter | | DE | VKM |
| 13029 | ASA | Alaska Airlines, Inc. | IATA: AS, Callsign: Alaska, IATA Prefix: 027, | USA | AVCODES |
| 13030 | ASA | Alaska Airlines, Inc. | IATA: AS | | ICAO1 |
| 13031 | ASA | THE BAY LINE RAILROAD [ATLANTA & ST. ANDREWS BAY RY] | | | PWRC |
| 13032 | ASAB | The Bay Line R.R., L.L.C. | added 4/1994; 7/2000-7/2005 | | NAKINA |
| 13033 | ASAB | Atlanta & Saint Andrews Bay Ry. Co. | 7/1954-1/1994; eliminated 4/1994 | | NAKINA |
| 13034 | ASAB | Atlanta & Saint Andrews Bay Ry. Co. | 10/57-1/94; eliminated 4/94 | | NRHS |
| 13035 | ASAB | The Bay Line R.R., L.L.C. | added 4/94; 7/2000 | | NRHS |
| 13036 | ASAB | THE BAY LINE RAILROAD [ATLANTA & ST. ANDREWS BAY RY] | | | PWRC |
| 13037 | ASAB | Atlanta and St. Andrews Bay Railway (Bay Line Railroad) | | | RSRV |
| 13038 | ASAB | ATLANTA & SAINT ANDREWS BAY RAILWAY | | | SCAC3 |
| 13039 | ASAB | Atlanta & Saint Andrews Bay Ry. Co. | | USA | TRAFFIC |
| 13040 | ASAC | ALL-STATES TRANSPORT CORP | | | SCAC3 |
| 13041 | ASAC | ASTAR AIR CARGO INC (SUB-CONTRACTIN | | | SCAC4 |
| 13042 | ASAD | AMBASSADOR SERVICES INC | | | SCAC4 |
| 13043 | ASAF | ASSOCIATED AIR FREIGHT INC | | | SCAC3 |
| 13044 | ASAF | ASSOCIATED AIR FREIGHT INC | | | SCAC4 |
| 13045 | ASAG | ARCTIC SLOPE/ALASKA GENERAL | | | SCAC3 |
| 13046 | ASAH | ALL STATES ASPHALT INC | | | SCAC3 |
| 13047 | ASAH | ALL STATES ASPHALT INC | | | SCAC4 |
| 13048 | ASAHI | Asahikawa Denkikidou (Asahikawa Electric Railway) | Previously operated a few suburban tramway lines | J | TRAFFIC |
| 13049 | ASAJ | ASAP FREIGHT SYSTEMS | | | SCAC4 |
| 13050 | ASAL | ASAP LINES INC | | | SCAC3 |
| 13051 | ASAM | ALL STATES MOVING AND STORAGE CO | | | SCAC3 |
| 13052 | ASAN | ACF SHIPPING AND TRADING INC | | | SCAC4 |
| 13053 | ASAN | Autosan | | PL | TRAFFIC |
| 13054 | ASAO | ASAP EXPRESS TRANSPORT INC | | | SCAC3 |
| 13055 | ASAO | A-SAP AUTO TRANSPORT LLC | | | SCAC4 |
| 13056 | ASAP | ASAP EXPRESS INC | | | SCAC3 |
| 13057 | ASAP | ASAP TRUCKING COMPANY | | | SCAC4 |
| 13058 | ASAQ | ALLSTATES AIR CARGO INC | | | SCAC3 |
| 13059 | ASAQ | ALLSTATES AIR CARGO INC | | | SCAC4 |
| 13060 | ASAS | ASSOCIATED SHIPPERS SERVICE | | | SCAC3 |
| 13061 | ASAS | ASAP DELIVERY | | | SCAC4 |
| 13062 | ASAT | A S & R TRUCKING CO | | | SCAC3 |
| 13063 | ASAU | ASASLINE | | B | BIC |
| 13064 | ASAU | ARGON S A | | | SCAC3 |
| 13065 | ASAU | PRAXAIR ESPANA | | | SCAC4 |
| 13066 | ASAW | ASAP TOWING & STORAGE CO INC | | | SCAC4 |
| 13067 | ASAX | Arkansas Steel Associates, LLC | added 10/2008 | | NAKINA |
| 13068 | ASAX | ARKANSAS STEEL ASSOCIATES | | | SCAC4 |
| 13069 | ASAY | A.S.A.P. DELIVERY | | | SCAC3 |
| 13070 | ASAY | A S A P DELIVERY | | | SCAC4 |
| 13071 | ASAZ | ASARCO | | | PWRC |
| 13072 | ASB | Air-Spray 1967 Ltd. | Callsign: Air Spray, | CDN | AVCODES |
| 13073 | ASB | Air-Spray 1967 Ltd. | | | ICAO1 |
| 13074 | ASBC | ALPHA SCHOOL BUS COMPANY INC | | | SCAC3 |
| 13075 | ASBC | ASSOCIATED HARDWOODS TRUCKING LLC | | | SCAC4 |
| 13076 | ASBD | ARMSTRONG TRANSFER & STORAGE CO INC | | | SCAC4 |
| 13077 | ASBE | ASBESTOS EXPRESS LIMITED | | | SCAC3 |
| 13078 | ASBF | ASBESTOS EASTERN TRANSPORT (US) INC | | | SCAC3 |
| 13079 | ASBH | A & S TRANSPORTATION INC | | | SCAC4 |
| 13080 | ASBI | ASSET BASED INTERMODAL | | | SCAC4 |
| 13081 | ASBL | ASCOT BUS LINES INC | | | SCAC3 |
| 13082 | ASBM | ASBURY, M L, INC | | | SCAC3 |
| 13083 | ASBO | ASHEBORO FORD TRACTOR INC | | | SCAC3 |
| 13084 | ASBP | A S P FORWARDING | | | SCAC3 |
| 13085 | ASBQ | ASSOCIATED BULK CARRIERS LTD | | | SCAC3 |
| 13086 | ASBQ | AVALON LOGISTICS LLC | | | SCAC4 |
| 13087 | ASBR | ARTESANIAS BRIONES | | | SCAC4 |
| 13088 | ASBS | A D STABLES | | | SCAC4 |
| 13089 | ASBT | ASBURY TRANSPORTATION CO INC | | | SCAC4 |
| 13090 | ASBU | ANTWERP SHIPPING & CHARTERING SVCS | | | SCAC3 |
| 13091 | ASBURY | Asbury Park - New York Transit | | USA | TRAFFIC |
| 13092 | ASBW | ACCURATE SHIPPING RESOURCES | | | SCAC4 |
| 13093 | ASBX | American Ship Building Co. | 8/1920-7/1930 | | NAKINA |
| 13094 | ASBX | American Synthetic Rubber Corp. | added 4/1961; 4/1961-4/1970; eliminated 7/1974 | | NAKINA |
| 13095 | ASBX | American Synthetic Rubber Corp. | added 4/61; 4/61-4/70; eliminated 7/74 | | NRHS |
| 13096 | ASBX | *AMERICAN SHIP BUILDING CO. | | | PWRC |
| 13097 | ASBX | *AMERICAN SYNTHETIC RUBBER CORP. | | | PWRC |
| 13098 | ASBX | AMERICAN SYNTHETIC RUBBER CORP | | | SCAC3 |
| 13099 | ASBY | ASHBY TRUCKING CORP | | | SCAC4 |
| 13100 | ASBZ | ASB BRIDGE | | | PWRC |
