| 1 | ATI | Aero-Tropics Air Services d/b/a Lip Air Ltd. | IATA: HC, Name changed to Lip-Air Pty. Ltd. d/b/a Aero-Tropics Air Services. Name changed from Lip-Air d/b/a Aero Tropics | AUS | AVCODES |
| 2 | ATI | Societa Aero Trasporti Italiani S.p.A. (ATI) | IATA: BM, Callsign: ATI, Merged into Alitalia on 30 October 1994. | I | AVCODES |
| 3 | ATI | Lip-Air d/b/a Aero Tropics | IATA: HC, Name changed to Aero-Tropics Air Services d/b/a Lip Air Ltd. | AUS | AVCODES |
| 4 | ATI | Lip-Air Pty. Ltd. d/b/a Aero-Tropics Air Services | IATA: HC, Name changed from Aero-Tropics Air Services d/b/a Lip Air Ltd. Name previously changed from Lip-Air d/b/a Aero Tropics | AUS | AVCODES |
| 5 | ATI | Art Avia LLC | Callsign: Art Avia, | RUS | AVCODES |
| 6 | ATI | Aero-Tropics Air Services | IATA: HC | | ICAO1 |
| 7 | ATIA | ALTIM INC | | | SCAC3 |
| 8 | ATIA | AU TEMPS TIC AUTO | | | SCAC4 |
| 9 | ATIB | ACTIVE TRANSPORT INC | | | SCAC3 |
| 10 | ATIB | ACTIVE TRANSPORT INC | | | SCAC4 |
| 11 | ATIB | Alpha Trains Iberia SA | | ES | VKM |
| 12 | ATIC | AMERICAN TRANSPORTATION INC | | | SCAC3 |
| 13 | ATIC | ATI | | | SCAC4 |
| 14 | ATID | ATI | | | SCAC4 |
| 15 | ATIE | ATLANTIC INTERMOUNTAIN EXPRESS INC | | | SCAC3 |
| 16 | ATIE | ARMSTRONG TRANSPORT GROUP INC | | | SCAC4 |
| 17 | ATIF | ATLANTIC FOODS INC | | | SCAC3 |
| 18 | ATIH | ATIM CARRIERS INC | | | SCAC3 |
| 19 | ATIH | AUTOFLETES INTERNACIONALES HALCON | | | SCAC4 |
| 20 | ATII | ACTIVE TRANSFER CO | | | SCAC3 |
| 21 | ATII | ATPAC TRANSPORT INC / ATPAC TRANSPO | | | SCAC4 |
| 22 | ATIK | ARROW TRANSPORTATION (INT) INC | | | SCAC3 |
| 23 | ATIL | ANTILLES TRUCKING CORPORATION | | | SCAC3 |
| 24 | ATIL | ANTILLES TRUCKING CORPORATION | | | SCAC4 |
| 25 | ATIM | ATLANTIC INTERSTATE MESSENGERS INC | | | SCAC3 |
| 26 | ATIM | ALWAYS TRUCKING INC | | | SCAC4 |
| 27 | ATIN | ALLEN TRANSPORTATION INCORPORATED | | | SCAC3 |
| 28 | ATIO | ACTION TRUCKING CORP | | | SCAC3 |
| 29 | ATIO | A & T TRANSPORTATION INC | | | SCAC4 |
| 30 | ATIP | ATICO TRANSPORT INC | | | SCAC3 |
| 31 | ATIQ | ATLANTIC TRUCKING CO | | | SCAC3 |
| 32 | ATIQ | ASAP FREIGHT INCORPORATED | | | SCAC4 |
| 33 | ATIR | A T I TRUCKING COMPANY INC | | | SCAC3 |
| 34 | ATIR | ATLANTA FOODS INTERNATIONAL | | | SCAC4 |
| 35 | ATIR | ATIR-RAIL S.A. | | F | TRAFFIC |
| 36 | ATIT | ASSOCIATED TRANSPORT INC | | | PWRC |
| 37 | ATIT | ARMADILLO TRANSPORT INC | | | SCAC3 |
| 38 | ATIT | AUTOTRANSITOS INTERNACIONALES SA DE | | | SCAC4 |
| 39 | ATIT | Alpha Trains Italia S.r.l. | | IT | VKM |
| 40 | ATIU | SOCIETE AUXILLAIRE DE TRANSPORT ET D'INDUSTRIES | | | PWRC |
| 41 | ATIU | Societe Auxillaire De Transport Et D'Industries | | | RSRV |
| 42 | ATIU | EUROTAINER SAS | | | SCAC4 |
| 43 | ATIV | ACTIVE TRANSFER COMPANY INC | | | SCAC3 |
| 44 | ATIW | ATOMIC TRANSPORT INCORPORATED | | | SCAC3 |
| 45 | ATIX | Alstom Transportation, Inc. | 7/2005 (not listed) | | NAKINA |
| 46 | ATIX | ALSTOM TRANSPORTATION, INC. | | | PWRC |
| 47 | ATIX | Alstom Transportation | | | RSRV |
| 48 | ATIX | ALSTOM TRANSPORTATION INC | | | SCAC4 |
| 49 | ATIY | ATLAS TOURS INC | | | SCAC3 |
