| 1 | ATS | Air Transport Service | | ZRE | AVCODES |
| 2 | ATS | Air Touring Services Ltd. | Callsign: ATS, | GB | AVCODES |
| 3 | ATS | Atlas Khomein Kish Air Taxi Service Co. | Callsign: Air Atlas, | IR | AVCODES |
| 4 | ATS | Air Transport Service | | | ICAO1 |
| 5 | ATS | Auto Transport Service AS | | NO | VKM |
| 6 | ATSA | AUTO TRANSPORTES AREL SA DE CV | | | SCAC4 |
| 7 | ATSA | ALSTOM TRANSPORTE S.A. (TGS) | | ES | VKM |
| 8 | ATSB | ADAMS TRANSPORTATION SERVICES INC | | | SCAC3 |
| 9 | ATSB | AUTO TRANSPORTES BALDAZO | | | SCAC4 |
| 10 | ATSC | ALASKA TRAIN SHIP CORP. | | | PWRC |
| 11 | ATSC | ARROW TRANSFER & STORAGE CO | | | SCAC3 |
| 12 | ATSC | A T SERVICES INC | | | SCAC4 |
| 13 | ATSD | ACE TRUCKING SERVICE INC | | | SCAC3 |
| 14 | ATSE | APPLE'S TRANSPORT SERVICE | | | SCAC3 |
| 15 | ATSE | ATHENS TRANSPORTATION SYSTEM INC | | | SCAC4 |
| 16 | ATSF | BNSF Ry. Co. | added 4/2005; 7/2005 | | NAKINA |
| 17 | ATSF | Atchison, Topeka & Santa Fe Ry. | 4/1938-1/1994; eliminated 7/1997 | | NAKINA |
| 18 | ATSF | The Burlington Northern Santa Fe Ry. Co. | added 7/1997; 7/2000; eliminated 4/2005 | | NAKINA |
| 19 | ATSF | Atchison, Topeka & Santa Fe Ry. | 4/38-1/94; eliminated 7/97 | | NRHS |
| 20 | ATSF | The Burlington Northern Santa Fe Ry. Co. | added 7/97; 7/2000 | | NRHS |
| 21 | ATSF | BNSF RAILWAY CO. [BURLINGTON NORTHERN AND SANTA FE; ATCHISON, TOPEKA & SANTA FE] | | | PWRC |
| 22 | ATSF | Atchison, Topeka and Santa Fe Railway (BNSF Railway) | | | RSRV |
| 23 | ATSF | ATCHINSON, TOPEKA & SANTA FE RAILWA | | | SCAC3 |
| 24 | ATSF | ATCHINSON, TOPEKA & SANTA FE RAILWA | | | SCAC4 |
| 25 | ATSF | Atchison, Topeka & Santa Fe Railway | | USA | TRAFFIC |
| 26 | ATSH | AMERICAN TRANSPORTATION SPECIALISTS | | | SCAC3 |
| 27 | ATSH | Arriva The Shires | | GB | TRAFFIC |
| 28 | ATSI | AAA TRUCKING SERVICE INC | | | SCAC3 |
| 29 | ATSJ | A T T S INC | | | SCAC3 |
| 30 | ATSK | ATS INC | | | SCAC3 |
| 31 | ATSK | ATS INC | | | SCAC4 |
| 32 | ATSL | ATLAS FREIGHT LINES | | | SCAC3 |
| 33 | ATSL | ARMSTRONG MOVING & STORAGE | | | SCAC4 |
| 34 | ATSM | ATLAS METAL & IRON CORP | | | SCAC3 |
| 35 | ATSN | ATSL, INC | | | SCAC3 |
| 36 | ATSO | ACME TRANSFER AND STORAGE | | | SCAC3 |
| 37 | ATSO | APOLLO TRANSPORTATION SOLUTIONS LLC | | | SCAC4 |
| 38 | ATSP | AMERICAN TRUCK STOP | | | SCAC3 |
| 39 | ATSP | ACTIVA TRANSPORTES Y SERVICIOS ESPE | | | SCAC4 |
| 40 | ATSR | ATS TRANSPORT INC | | | SCAC3 |
| 41 | ATSR | A T SERVICES PETERBOROUGH ON | | | SCAC4 |
| 42 | ATSS | AMERISTAR TRANSPORTATION SERVICES I | | | SCAC3 |
| 43 | ATST | APOLLO AIR FREIGHT CORP | | | PWRC |
| 44 | ATST | ATLAS TRUCKING | | | SCAC3 |
| 45 | ATST | ATS TRANSPORT | | | SCAC4 |
| 46 | ATSU | ANSTO | | AUS | BIC |
| 47 | ATSU | The Atchison, Topeka and Santa Fe Ry. Co. | added 4/1975; eliminated 10/1976 | | NAKINA |
| 48 | ATSU | The Atchison, Topeka and Santa Fe Ry. Co. | added 4/75 | | NRHS |
| 49 | ATSU | BURLINGTON NORTHERN AND SANTA FE [ATCHISON, TOPEKA & SANTA FE] | | | PWRC |
| 50 | ATSV | AUTOMOBILE TRANSPORT SUPPLY LTD | | | SCAC4 |
| 51 | ATSW | AMERICAN TRANSPORT SYSTEMS | | | SCAC3 |
| 52 | ATSW | AMERICAN TRANSPORT SYSTEMS | | | SCAC4 |
| 53 | ATSX | Atlantic Sugar Refineries Ltd. | added 4/1956; 10/1957-4/1961; eliminated 1/1963 | | NAKINA |
| 54 | ATSX | Atlantic Sugar Refineries Co. Ltd. | added 1/1963; 7/1965; 4/1970; eliminated 10/1971 | | NAKINA |
| 55 | ATSX | Atlantic Sugar Refineries Co. Ltd. | 10/57-4/70; eliminated 10/71 | | NRHS |
| 56 | ATSX | ATLANTIC SUGAR REFINERIES CO. | | | PWRC |
| 57 | ATSX | ATLANTIC SUGAR REFINERIES CO LTD | | | SCAC3 |
| 58 | ATSY | ARIES TRANSPORTATION SYSTEM INC | | | SCAC3 |
| 59 | ATSY | ALPHA TRANSPORTATION SYSTEMS INC | | | SCAC4 |
