| 1 | ATN | Air Transport International LLC | IATA: 8C, Callsign: Air Transport, | USA | AVCODES |
| 2 | ATN | Air Transport International | IATA: 8C | | ICAO1 |
| 3 | ATN | Alabama & Tennessee River Railway | | | RSRV |
| 4 | ATN | ALABAMA AND TENNESSEE RIVER RAILWAY | | | SCAC4 |
| 5 | ATN | Arriva Trains Northern | 1999: 2043km standard gauge, electrified at 25kV 50Hz Arriva Trains Northern was a train operating company that operated passenger trains in Northern England. The company had previously been known as Northern Spirit before being taken over Arriva. The franchise was taken over by Northern Rail in December 2004. | GB | TRAFFIC |
| 6 | ATN | Atenon Sp. z o.o. Sp. K. | | PL | VKM |
| 7 | ATNB | ARMOR TRANSPORTATION INC | | | SCAC3 |
| 8 | ATNB | A & C TRUCKING LLC | | | SCAC4 |
| 9 | ATNC | ATLANTIC TRUCKING INCORPORATED | | | SCAC3 |
| 10 | ATND | ALL TRANSPORT INC | | | SCAC3 |
| 11 | ATND | ALLSET TRANSPORT LTD | | | SCAC4 |
| 12 | ATNE | ARAGON TRANSPORTATION ENTERPRISES I | | | SCAC3 |
| 13 | ATNE | ASTRO OF NEW ENGLAND | | | SCAC4 |
| 14 | ATNF | AMERICAN TRANS-FREIGHT INC | | | SCAC3 |
| 15 | ATNG | AMERICAN TRANSFER & STORAGE CO INC | | | SCAC3 |
| 16 | ATNG | AMERICAN TRANSPORT LOGISTICS | | | SCAC4 |
| 17 | ATNH | ALUMINUM TRANSPORT INC | | | SCAC3 |
| 18 | ATNI | AT&T INFORMATION SYSTEM | | | SCAC3 |
| 19 | ATNI | ANKER TRUCKING INC | | | SCAC4 |
| 20 | ATNJ | ACTION TRANSPORTATION INC | | | SCAC3 |
| 21 | ATNK | ALL TRANS INC | | | SCAC3 |
| 22 | ATNK | ALPHA TANKERS AND FREIGHTERS INTERN | | | SCAC4 |
| 23 | ATNM | AMERICAN TRAFFIC MANAGEMENT | | | SCAC3 |
| 24 | ATNM | AUTO TRANSPORTES MEJIA BENAVIDEZ | | | SCAC4 |
| 25 | ATNN | A T L INC | | | SCAC4 |
| 26 | ATNP | AUSTINS TRANSPORTATION INC | | | SCAC4 |
| 27 | ATNQ | AAA T TRUCKING | | | SCAC3 |
| 28 | ATNQ | AUTO TANQUES SUAREZ SA DE CV | | | SCAC4 |
| 29 | ATNS | ARROW TRANSFER & STORAGE CO | | | SCAC3 |
| 30 | ATNS | ATLANSHIP S A | | | SCAC4 |
| 31 | ATNT | ATLANTIC TRANSPORTATION COMPANY | | | SCAC3 |
| 32 | ATNT | ATORON TRUCKING CORPORATION | | | SCAC4 |
| 33 | ATNU | ANELTIA TRADING, S.L.U. | | E | BIC |
| 34 | ATNU | ADVANCED TECHNICAL TRADING SERVICES | | | SCAC4 |
| 35 | ATNV | ACME TRANSPORT SERVICES INC | | | SCAC4 |
| 36 | ATNW | ATLANTIC & WESTERN TRANSPORT INC | | | SCAC3 |
| 37 | ATNW | ALANIS TRUCKING COMPANY | | | SCAC4 |
| 38 | ATNY | ATRANS INCORPORATED | | | SCAC3 |
| 39 | ATNY | ANTELOPE TRANSPORTATION LP | | | SCAC4 |
