| 6401 | AIMO | AIR INTERMODAL RECEIVING INC | | | SCAC3 |
| 6402 | AIMP | AIM TRANSPORT | | | SCAC4 |
| 6403 | AIMQ | AIM SERVICE INC | | | SCAC3 |
| 6404 | AIMS | AIM TRANSFER & STORAGE INC | | | SCAC4 |
| 6405 | AIMU | TRS CONTAINERS & CHASSIS | | USA | BIC |
| 6406 | AIMU | TRS Containers & Chassis | | | RSRV |
| 6407 | AIMU | AMERICAN INTERNATIONAL | | | SCAC4 |
| 6408 | AIMV | AMERICAN INTERNATIONAL MOVING CORPO | | | SCAC3 |
| 6409 | AIMV | AMERICAN INTERNATIONAL MOVING CORPO | | | SCAC4 |
| 6410 | AIMW | AIM NATIONALEASE | | | SCAC4 |
| 6411 | AIMX | AMERICAN IRON & METAL LP | | | PWRC |
| 6412 | AIMX | AMERICAN IRON & METAL LP | | | SCAC4 |
| 6413 | AIMY | AJIBOLA INTERNATIONAL MOTORS | | | SCAC4 |
| 6414 | AIN | African International Airways | IATA: WS, Callsign: Fly Cargo, IATA Prefix: 648, Founded in 1985. Ceased operations in 2008. Designator WS recalled by IATA | ZA | AVCODES |
| 6415 | AIN | African International Airways | | | ICAO1 |
| 6416 | AINA | AMERICAN INFRASTRUCTURE MARYLAND | | | SCAC4 |
| 6417 | AINB | ATL INC | | | SCAC4 |
| 6418 | AIND | AIR LAND & SEA INC | | | SCAC3 |
| 6419 | AINF | AMERICAN INTERNATIONAL FORWARDERS | | | SCAC3 |
| 6420 | AINF | ASL INC | | | SCAC4 |
| 6421 | AING | AUTOLINEA INTERNACIONAL GARCOSS | | | SCAC4 |
| 6422 | AINH | AMERICAN CLASSIC CHARTERS & TOURS I | | | SCAC3 |
| 6423 | AINI | AMASH IMPORTS INC | | | SCAC3 |
| 6424 | AINI | AMASH IMPORTS INC | | | SCAC4 |
| 6425 | AINK | ATRANS INC | | | SCAC4 |
| 6426 | AINL | ARAS INTERNATIONAL INC. | | | SCAC3 |
| 6427 | AINL | ARAS INTERNATIONAL INC. | | | SCAC4 |
| 6428 | AINN | ALMAS INTERNATIONAL | | | SCAC3 |
| 6429 | AINN | AERONET INC | | | SCAC4 |
| 6430 | AINO | Ainokaze Toyama Railway | | J | TRAFFIC |
| 6431 | AINO | ARGE Istandhaltung Niederösterreich | | AT | VKM |
| 6432 | AINP | ALLEN INC | | | SCAC3 |
| 6433 | AINP | ATS INTERNATIONAL SERVICES INC | | | SCAC4 |
| 6434 | AINQ | AINESON, DELL INC | | | SCAC3 |
| 6435 | AINR | ALLIANCE AIRLINES | | | SCAC4 |
| 6436 | AINT | AMANA INC | | | SCAC4 |
| 6437 | AINW | AMERICANA INC | | | SCAC3 |
| 6438 | AINW | AMERICYCLE INC | | | SCAC4 |
| 6439 | AINX | TTX Company, Acorn Division | added 1/1992; 1/1994-7/2000; eliminated 1/2003; 7/2005 (not listed) | | NAKINA |
| 6440 | AINX | Trailer Train Co., Acorn Division | 1/1985 (not listed); added 4/1985; eliminated 1/1992 | | NAKINA |
| 6441 | AINX | Trailer Train Co., Acorn Division | added 4/85; eliminated 1/92 | | NRHS |
| 6442 | AINX | TTX Company, Acorn Division | added 1/92; 1/94-7/2000 | | NRHS |
| 6443 | AINX | TTX COMPANY - ACORN DIVISION | | | PWRC |
| 6444 | AINX | TTX Corporation Acorn Division | | | RSRV |
| 6445 | AINX | TTX COMPANY | | | SCAC4 |
| 6446 | AINY | A & M OIL COMPANY INC | | | SCAC4 |
| 6447 | AIO | Chief of Staff, United States Air Force | Callsign: Air Chief, | USA | AVCODES |
| 6448 | AIO | Avis | Callsign: Avis, | UA | AVCODES |
| 6449 | AIO | United States Air Force | | | ICAO1 |
| 6450 | AIOA | ALCO IRON & METAL CO | | | SCAC3 |
| 6451 | AIOA | ALCO IRON & METAL CO INC | | | SCAC4 |
| 6452 | AIOB | ACTION TRANSPORTATION INC | | | SCAC3 |
| 6453 | AIOC | AIRDROME ORCHARDS INC | | | SCAC3 |
| 6454 | AIOD | ALL IN ONE (1) TRANSPORT INC | | | SCAC4 |
| 6455 | AIOE | AMERI-CO CARRIERS INC | | | SCAC3 |
| 6456 | AIOE | AMERI-CO CARRIERS INC | | | SCAC4 |
| 6457 | AIOF | AIMS INTERNATIONAL FREIGHT INC | | | SCAC3 |
| 6458 | AIOL | AMERICAN INTERNATIONAL LIMOUSINE | | | SCAC3 |
| 6459 | AIOM | ACTION MESSENGER INC | | | SCAC3 |
| 6460 | AION | ACTION TRANSPORT EXPRESS | | | SCAC4 |
| 6461 | AIOO | AMERICAN TRANSPORTATION CONSULTANTS | | | SCAC3 |
| 6462 | AIOP | ACTION CARRIERS CORP | | | SCAC3 |
| 6463 | AIOQ | ALL IN ONE SERVICE | | | SCAC3 |
| 6464 | AIOT | ATLANTIC TRANSPORT INC | | | SCAC3 |
| 6465 | AIOW | ACTION TRANSPORT INC | | | SCAC3 |
| 6466 | AIP | Alpine Aviation, Inc. | IATA: 5A, Callsign: Alpine Air, | USA | AVCODES |
| 6467 | AIP | Alpine Air Express | IATA: 5A | | ICAO1 |
| 6468 | AIPA | AMERICAN ROAD LINES | | | SCAC3 |
| 6469 | AIPA | ARL | | | SCAC4 |
| 6470 | AIPD | AIRPORT PICK-UP AND DELIVERY SERVIC | | | SCAC3 |
| 6471 | AIPD | AIP LOGISTICS LTD | | | SCAC4 |
| 6472 | AIPE | AIRPORT EXPRESS | | | SCAC3 |
| 6473 | AIPE | AIP SPECIALTIES LLC | | | SCAC4 |
| 6474 | AIPG | AIR-MAR SHIPPING INC. | | | SCAC3 |
| 6475 | AIPI | AIRPORT DELIVERY INC | | | SCAC3 |
| 6476 | AIPL | AIRPLANE SALES & CHARTER CO | | | SCAC3 |
| 6477 | AIPM | AIR PRODUCTS & CHEMICALS INC | | | SCAC3 |
| 6478 | AIPM | AIR PRODUCTS & CHEMICALS INC | | | SCAC4 |
| 6479 | AIPN | A I P TRUCKING INC | | | SCAC3 |
| 6480 | AIPQ | AIR POWER INC | | | SCAC3 |
| 6481 | AIPR | ALLIED PAPER INC | | | SCAC3 |
| 6482 | AIPS | AIRPORT DELIVERY SERVICE INC | | | SCAC3 |
| 6483 | AIPT | AIRPORTRAVEL USA INC | | | SCAC3 |
| 6484 | AIPU | A.I.P.P INDUSTRIES LTD | | IL | BIC |
| 6485 | AIPX | Ferrous Processing and Trading Co. | added 4/2007 | | NAKINA |
| 6486 | AIPX | Atlas Iron Processors, Inc. | added 7/1994; eliminated 7/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 6487 | AIPX | Atlas Iron Processors, Inc. | added 7/94; eliminated 7/97; 7/2000 | | NRHS |
| 6488 | AIPX | FERROUS PROCESSING & TRADING CO. [ATLAS IRON PROCESSORS, INC.] | | | PWRC |
| 6489 | AIPX | Atlas Iron Processors | | | RSRV |
| 6490 | AIPX | ATLAS IRON PROCESSORS, INC. | | | SCAC4 |
| 6491 | AIQ | Thai AirAsia Co. Ltd. | IATA: FD, Callsign: Thai Asia, IATA Prefix: 900, Subsidary of Air Asia Malaysia AK/AXM | T | AVCODES |
| 6492 | AIQ | Thai AirAsia | IATA: FD | | ICAO1 |
| 6493 | AIQ | Thai AirAsia | | T | TRAFFIC |
| 6494 | AIQC | AMERICAN COMMODITIES INC | | | SCAC3 |
| 6495 | AIQM | ACTION MESSENGER SERVICE | | | SCAC3 |
| 6496 | AIQM | AMI INDIA LOGISTICS PRIVATE LIMITED | | | SCAC4 |
| 6497 | AIQO | ANTAIOS MARINE LTD. | | | SCAC3 |
| 6498 | AIQP | ADVANTAGE TRUCKING INC | | | SCAC4 |
| 6499 | AIQS | ACTION SHIPPING CORPORATION | | | SCAC3 |
| 6500 | AIQV | AMERICAN MOVING SERVICES | | | SCAC3 |
