| 1 | ATW | Aero Trades (Western) Ltd. | IATA: VM, Callsign: Aero Trades, | CDN | AVCODES |
| 2 | ATW | Athens Airways S.A. | IATA: ZF, Callsign: Athens Airways, Founded in 2008. Commenced operations on 31 January 2009. Ceased operations in September 2010. | GR | AVCODES |
| 3 | ATW | Air Antwerp | IATA: WP, Callsign: Devil, Ceased operations on 12 June 2021. | B | AVCODES |
| 4 | ATW | Aero Trades (Western) Ltd. | | | ICAO1 |
| 5 | ATW | Atlantic and Western Ry., L.P. | added 4/1992; 1/1994-7/2005 | | NAKINA |
| 6 | ATW | Atlantic and Western Ry. Co. | 1/1975-1/1980; eliminated 1/1992 | | NAKINA |
| 7 | ATW | ATW Ry., L.P. | added 1/1992; eliminated 4/1992 | | NAKINA |
| 8 | ATW | Atlantic and Western Ry. Co. | 1/75-1/80; eliminated 1/92 | | NRHS |
| 9 | ATW | ATW Ry., L.P. | added 1/92; eliminated 4/92 | | NRHS |
| 10 | ATW | Atlantic and Western Ry., L.P. | added 4/92; 1/94-7/2000 | | NRHS |
| 11 | ATW | ATLANTIC AND WESTERN RAILWAY, LP | | | PWRC |
| 12 | ATW | Atlantic and Western Railway | | | RSRV |
| 13 | ATW | ATLANTIC & WESTERN RAILWAY, L P | | | SCAC4 |
| 14 | ATW | Arriva Trains Wales | Arriva Trains Wales / Trenau Arriva Cymru is a train operating company that operates urban and inter urban passenger services in Wales and the Welsh Marches. The company was formed when Wales and West was split into Wales and Borders and Wessex Trains. Initially both were operated by National Express Group, which presently owns seven of the UK’s 25 operators. Arriva won the Wales and Borders franchise in 2003 and promptly renamed the company Arriva Trains Wales. They operate almost all services in Wales, with the execption of long distance express services | GB | TRAFFIC |
| 15 | ATW | Arriva Trains Wales / Trenau Arriva Cymru | | UK | VKM |
| 16 | ATWA | ATWATER GRAIN CO | | | SCAC3 |
| 17 | ATWC | AMERICAN TOWING INC | | | SCAC3 |
| 18 | ATWE | ATWELL, CHARLES B | | | SCAC3 |
| 19 | ATWF | AROUND THE WORLD FORWARDING INC | | | SCAC3 |
| 20 | ATWG | ACE TOWING | | | SCAC3 |
| 21 | ATWH | AUTO WHOLESALERS & TRANSPORT INC | | | SCAC3 |
| 22 | ATWH | AROUNDTHE WORLD HAND MADE CARPETS | | | SCAC4 |
| 23 | ATWI | ALS TOWING SERVICE | | | SCAC3 |
| 24 | ATWI | ABSOLUTE TRANSPORTATION INC | | | SCAC4 |
| 25 | ATWJ | ALS TOWING AND RECOVERY INC | | | SCAC3 |
| 26 | ATWK | ARTS TRACTOR WORK | | | SCAC3 |
| 27 | ATWM | ANDYS TOWING INC | | | SCAC3 |
| 28 | ATWN | ALLANDALE TOWING SERVICES | | | SCAC3 |
| 29 | ATWO | ALASKA TOWING & WRECKING | | | SCAC3 |
| 30 | ATWP | AFFORDABLE TOWING & TRANSPORTATION | | | SCAC4 |
| 31 | ATWQ | ALABAMA TRANSFER & WAREHOUSE CO | | | SCAC3 |
| 32 | ATWR | Atlantic and Western | Real: ATW | USA | TRAFFIC |
| 33 | ATWS | ALL AMERICAN TOWING SERVICE INC | | | SCAC3 |
| 34 | ATWT | ATWOOD TRUCKING INC | | | SCAC3 |
| 35 | ATWU | CONTAINZ PTY LTD | | | SCAC4 |
| 36 | ATWV | ATTAWAY TRANSPORTATION SYSTEMS | | | SCAC3 |
| 37 | ATWV | ALLIED TOWING SERVICE INC | | | SCAC4 |
| 38 | ATWW | AAA WORLD-WIDE TRAVEL AGENCY | | | SCAC3 |
| 39 | ATWW | ATLANTIC NATIONWIDE TRANSPORTATION | | | SCAC4 |
| 40 | ATWY | ATLANTIC TRAILWAYS | | | SCAC3 |
| 41 | ATWY | ATI | | | SCAC4 |
