| 1 | AST | Air Astana | IATA: 4L, Callsign: Astanaline, ICAO designator changed to KZR. IATA Designator changed from LQ* | KZ | AVCODES |
| 2 | AST | Aerolineas Del Oeste, S.A. de C.V. | Callsign: Aeroeste, | MEX | AVCODES |
| 3 | AST | Air Astana | IATA: LQ, IATA Designator changed to 4L | KZ | AVCODES |
| 4 | AST | Astro Airways Corp. | Callsign: Astro-Air, | USA | AVCODES |
| 5 | AST | Air Sarina AG | Callsign: Air Sarina, | CH | AVCODES |
| 6 | AST | Thai Summer Airways Company Limited | Callsign: Thai Summer, | T | AVCODES |
| 7 | AST | Aerlineas Del Oeste | | | ICAO1 |
| 8 | AST | AMERICANSTAR TOURS INC | | | SCAC4 |
| 9 | ASTA | ASTER TRUCKING CORP | | | SCAC3 |
| 10 | ASTA | ALISTA MARITIME INC | | | SCAC4 |
| 11 | ASTB | ASSOCIATED TRANSPORT SERVICE INC | | | SCAC3 |
| 12 | ASTC | ASSOCIATED TRANSPORTATION CO, INC | | | SCAC3 |
| 13 | ASTC | ALL STAR TRUCK SERVICES | | | SCAC4 |
| 14 | ASTD | ASSOCIATED TRANSFER & STORAGE, INC | | | SCAC3 |
| 15 | ASTD | ASSOCIATED TRANSFER & STORAGE INC | | | SCAC4 |
| 16 | ASTE | ALLSTAR TRANSFER & STORAGE CO | | | SCAC3 |
| 17 | ASTE | ALCOA STEAMSHIP COMPANY INC | | | SCAC4 |
| 18 | ASTF | ALL STATE TRANSPORT INC | | | SCAC3 |
| 19 | ASTF | ALL STATE TRANSPORT INC | | | SCAC4 |
| 20 | ASTI | ACTIVE STORAGE & TRANSPORT CO | | | SCAC3 |
| 21 | ASTI | AIR SEA TRANSPORT INC | | | SCAC4 |
| 22 | ASTJ | ALL-STATE TRANSPORTATION | | | SCAC4 |
| 23 | ASTL | ASSOCIATED TANK LINES CO, INC | | | SCAC3 |
| 24 | ASTL | AL'S TRUCKING LLC | | | SCAC4 |
| 25 | ASTM | ASTROSPEED TRANSPORT & MOVING CO | | | SCAC3 |
| 26 | ASTM | ACTROS TRANSPORT INC | | | SCAC4 |
| 27 | ASTN | AUSTIN, J CARTAGE COMPANY | | | SCAC3 |
| 28 | ASTN | ASSOCIATED TRANSPORT CO INC | | | SCAC4 |
| 29 | ASTO | ASTRO TRUCKING INC | | | SCAC3 |
| 30 | ASTO | ALL STATES TRANSPORT LLC | | | SCAC4 |
| 31 | ASTON | Aston Martin | | GB | TRAFFIC |
| 32 | ASTP | ASH TRANSPORT | | | SCAC3 |
| 33 | ASTQ | ASSOCIATED TRUCKERS | | | SCAC3 |
| 34 | ASTQ | A & S TRANSPORT INC | | | SCAC4 |
| 35 | ASTR | Astra Finance / \"Астра финанс\" ЕООД | | BG | VKM |
| 36 | ASTRA | ASTRA VAGOANE ARAD SA | | RO | VKM |
| 37 | ASTS | ASSOCIATED TRANSPORT LINES | | | SCAC3 |
| 38 | ASTS | ASSOCIATED TRANSPORT LINE LLC | | | SCAC4 |
| 39 | ASTT | ALLSTATE TRUCK LINE, INC | | | SCAC3 |
| 40 | ASTU | ALMALY TK | | KZ | BIC |
| 41 | ASTUR | Association de Sauvegarde des Transports Urbains de Reims | | F | TRAFFIC |
| 42 | ASTV | ASSOCIATED STORAGE & VAN INC | | | SCAC3 |
| 43 | ASTV | ASSOCIATED STORAGE & VAN INC | | | SCAC4 |
| 44 | ASTX | Asarco LLC | added 10/2008 | | NAKINA |
| 45 | ASTX | Asarco Inc. | added 10/1975; 1/1980-7/2005; eliminated 10/2008 | | NAKINA |
| 46 | ASTX | American Smelting and Refining Co. | added 1/1974; 1/1975; eliminated 10/1975 | | NAKINA |
| 47 | ASTX | American Sheet & Tin Plate Co. | 7/1937 (not listed) | | NAKINA |
| 48 | ASTX | American Sheet & Tin Plate Co. (Carnegie-Illinois Steel Corp.) | 7/1936 | | NAKINA |
| 49 | ASTX | American Sheet & Tin Plate Co. | 7/1930-7/1935; 7/1937 (not listed) | | NAKINA |
| 50 | ASTX | American Smelting and Refining Co. | added 1/74; 1/75 | | NRHS |
| 51 | ASTX | Asarco Inc. | 1/80-7/2000 | | NRHS |
| 52 | ASTX | ASARCO INCORPORATED [AMERICAN SHEET & TIN PLATE CO.; AMERICAN SMELTING & REFINING CO.] | | | PWRC |
| 53 | ASTX | ASARCO | | | RSRV |
| 54 | ASTX | ASARCO LLC | | | SCAC4 |
| 55 | ASTY | ALLSTAR MAYFLOWER LLC | | | SCAC4 |
| 56 | ASTZ | ACME STEEL | | | PWRC |
