| 10401 | AOE | Air Europe | IATA: AE, Callsign: Air Europe, Ceased operations on 08 March 1991. IATA Code changed from EB | GB | AVCODES |
| 10402 | AOE | Aerososel | Callsign: Sosel, | RCH | AVCODES |
| 10403 | AOE | Air One Executive S.p.A. | | I | AVCODES |
| 10404 | AOE | Livingston Executive S.p.A. | Callsign: Livingston Air, | I | AVCODES |
| 10405 | AOE | Air One Executive | | | ICAO1 |
| 10406 | AOE | American Orient Express | | USA | TRAFFIC |
| 10407 | AOEC | AQUA OVO EXPERIENCE INC | | | SCAC4 |
| 10408 | AOED | AMERICAN CARGO EXPRESS INC | | | SCAC4 |
| 10409 | AOEG | ATOMAC CARTAGE SYSTEMS INC | | | SCAC3 |
| 10410 | AOEG | ATOMAC CARTAGE SYSTEMS INC | | | SCAC4 |
| 10411 | AOEI | AMERPAC OCEAN EXPRESS INC | | | SCAC3 |
| 10412 | AOEI | ATLANTIC OVERSEAS EXPRESS INC | | | SCAC4 |
| 10413 | AOEL | A-ONE (A-1) NATIONAL LIMOUSINE SERV | | | SCAC3 |
| 10414 | AOEL | ALPHA ONE (1) EXPEDITED LOGISTICS I | | | SCAC4 |
| 10415 | AOEP | AERO EXPRESS | | | SCAC3 |
| 10416 | AOEQ | A-ONE (A-1) PICK UP & DELIVERY | | | SCAC3 |
| 10417 | AOES | ALCONES L A EXPRESS INC | | | SCAC3 |
| 10418 | AOEU | AGA TRANSPORT GESELLSCHAFT MBH | | | SCAC3 |
| 10419 | AOEV | A-ONE (A-1) MOVING SYSTEMS INC | | | SCAC3 |
| 10420 | AOEX | American Orient Express Ry. Co. LLC | 7/2005 (not listed) | | NAKINA |
| 10421 | AOEX | American Oil Export Co., Inc. | 8/1920 | | NAKINA |
| 10422 | AOEX | *AMERICAN OIL EXPORT CO., INC. | | | PWRC |
| 10423 | AOEX | +AMERICAN ORIENT EXPRESS RAILWAY | | | PWRC |
| 10424 | AOEX | American Orient Express Railway | | | RSRV |
| 10425 | AOEX | AMERICAN RAILWAY EXPLORER INC | | | SCAC4 |
| 10426 | AOF | Atair Pty Ltd. | Callsign: Atair, | ZA | AVCODES |
| 10427 | AOF | Atair Pty Ltd. | | | ICAO1 |
| 10428 | AOFA | A-ONE (A-1) FREEMAN NORTH AMERICAN | | | SCAC3 |
| 10429 | AOFA | A-ONE (A-1) FREEMAN NORTH AMERICAN | | | SCAC4 |
| 10430 | AOFC | ACE OF CALIFORNIA MOVING & STORAGE | | | SCAC3 |
| 10431 | AOFC | ASTROTURF LLC | | | SCAC4 |
| 10432 | AOFD | ALPHA OMEGA FREIGHT SYSTEMS LTD | | | SCAC4 |
| 10433 | AOFE | A-ONE (A-1) AIR FREIGHT SERVICE INC | | | SCAC3 |
| 10434 | AOFG | A-ONE (A-1) FREIGHT SERVICE | | | SCAC3 |
| 10435 | AOFI | A B C MOTOR FREIGHT INC | | | SCAC3 |
| 10436 | AOFJ | ARCO FREIGHT LLC | | | SCAC4 |
| 10437 | AOFL | A-ONE (A-1) FREEMAN RELOCATION SYST | | | SCAC3 |
| 10438 | AOFL | ALFARO BARRIENTOS, MAXIMILIANO | | | SCAC4 |
| 10439 | AOFM | ATLANTA OFFICE MOVERS INC | | | SCAC3 |
| 10440 | AOFN | A-ONE (A-1) FREEMAN NORTH AMERICAN | | | SCAC4 |
| 10441 | AOFQ | A-ONE (A-1) FARGO VAN & STG INC | | | SCAC3 |
| 10442 | AOFQ | A-ONE (A-1) FARGO VAN AND STORAGE I | | | SCAC4 |
| 10443 | AOFR | A-ONE (A-1) FREEMAN MOVING & STORAG | | | SCAC3 |
| 10444 | AOFS | A-ONE (A-1) FAMILY MOVING & STORAGE | | | SCAC3 |
| 10445 | AOFS | ABSOLUTE FREIGHT SOLUTIONS INC | | | SCAC4 |
| 10446 | AOFT | A-ONE (A-1) FREIGHT SYSTEMS | | | SCAC4 |
| 10447 | AOFV | AMERICAN OCEAN FREIGHT SVCS | | | SCAC3 |
| 10448 | AOFV | AMERICAN OCEAN FREIGHT SERVICES | | | SCAC4 |
| 10449 | AOFY | AERO FLIGHT SERVICES INC | | | SCAC3 |
| 10450 | AOG | Aero VIP, S.A. | IATA: 2D, Callsign: Avip, Designator 2D reinstated by IATA | RA | AVCODES |
| 10451 | AOG | Aero VIP, S.A. | IATA: NJ, Callsign: Avip, IATA Prefix: 592, Established on 15 March 1999. Commenced operations on 23 June 1999. Ceased operations in November 2010. | RA | AVCODES |
| 10452 | AOG | Aero VIP | IATA: 2D | | ICAO1 |
| 10453 | AOGC | APPEAL MOVING CO INC | | | SCAC3 |
| 10454 | AOGC | AOG COURRIER SERVICE | | | SCAC4 |
| 10455 | AOGE | ARMSTRONG, LEE | | | SCAC4 |
| 10456 | AOGH | AOG HELISERVICES INC | | | SCAC4 |
| 10457 | AOGI | ALLINGTON TRANSPORT INC | | | SCAC4 |
| 10458 | AOGK | AOG TRUCKING | | | SCAC4 |
| 10459 | AOGL | A ONE G (A1G) LOGISTICS & TRANSPORT | | | SCAC4 |
| 10460 | AOGM | AMERIPRO LOGISTICS LLC | | | SCAC4 |
| 10461 | AOGO | AGPRO LOGISTICS INC | | | SCAC4 |
| 10462 | AOGP | ACT LOGISTICS GROUP INC | | | SCAC4 |
| 10463 | AOGQ | AMINO LOGISTICS INC | | | SCAC4 |
| 10464 | AOGR | A ONE (1) GROUP INC | | | SCAC4 |
| 10465 | AOH | North Coast Aviation | Callsign: Air Ohio, | USA | AVCODES |
| 10466 | AOH | North Coast Aviation Pty Ltd. | IATA: N9, | PNG | AVCODES |
| 10467 | AOHA | ASTRO HALIETO ARMADORA S.A. | | | SCAC3 |
| 10468 | AOHC | AMARILLO HARDWARE COMPANY | | | SCAC3 |
| 10469 | AOHG | ALLARDS OIL HEAT AND GAS SERVICES | | | SCAC4 |
| 10470 | AOHM | A-ONE (A-1) HORTONS MOVING SERVICE | | | SCAC3 |
| 10471 | AOHM | A-ONE (A-1) HORTONS MOVING SERVICE | | | SCAC4 |
| 10472 | AOHT | ALL-OHIO TRUCKING | | | SCAC3 |
| 10473 | AOI | Astoria, Inc. | Callsign: Astoria, | CDN | AVCODES |
| 10474 | AOI | Astoria, Inc. | | | ICAO1 |
| 10475 | AOIB | ALBERTS ORGANCIS INC | | | SCAC4 |
| 10476 | AOIE | AMERICAN NATIONAL LOGISTICS INC | | | SCAC4 |
| 10477 | AOIG | AIR ONE INTERNATIONAL | | | SCAC3 |
| 10478 | AOIG | AAA OIL INC | | | SCAC4 |
| 10479 | AOII | ALDERWOOD FORWARDING INC | | | SCAC3 |
| 10480 | AOIK | ATLAS OIL I LTD | | | SCAC4 |
| 10481 | AOIL | ASTRO INC, MONROVIA LIBERIA | | | SCAC3 |
| 10482 | AOIL | ALLIED OIL | | | SCAC4 |
| 10483 | AOIM | A1 IMPORT/EXPORT LLC | | | SCAC4 |
| 10484 | AOIM | Aoimori Railway | | J | TRAFFIC |
| 10485 | AOIN | ALL OCCASION LIMOUSINE | | | SCAC3 |
| 10486 | AOIN | A-ONE (A-1) INTERSTATE INC | | | SCAC4 |
| 10487 | AOIR | ABLE OIL | | | SCAC4 |
| 10488 | AOIS | ARTOIS TRUCKING | | | SCAC3 |
| 10489 | AOIT | A-ONE (A-1) INTERNATIONAL COURIER S | | | SCAC3 |
| 10490 | AOIT | A-ONE (A-1) INTERNATIONAL INC | | | SCAC4 |
| 10491 | AOIV | ATCO INC | | | SCAC3 |
| 10492 | AOIX | Marathon Petroleum Co. LLC | added 1/2007 | | NAKINA |
| 10493 | AOIX | Marathon Ashland Petroleum LLC | added 1/1999; 7/2000-7/2005; eliminated 1/2006; added 4/2006; eliminated 1/2007 | | NAKINA |
| 10494 | AOIX | Ashland Petroleum Co., Division of Ashland Oil, Inc. | added 4/1995; eliminated 1/1999 | | NAKINA |
| 10495 | AOIX | Ashland Petroleum Co., Division of Ashland Oil, Inc. | added 4/95; eliminated 1/99 | | NRHS |
| 10496 | AOIX | Marathon Ashland Petroleum LLC | added 1/99; 7/2000 | | NRHS |
| 10497 | AOIX | MARATHON PETROLEUM CO. [MARATHON ASHLAND PETROLEUM CO.; ASHLAND OIL CO. | | | PWRC |
| 10498 | AOIX | Ashland Oil (Marathon Petroleum) | | | RSRV |
| 10499 | AOIX | MARATHON PETROLEUM COMPANY LLC | | | SCAC4 |
| 10500 | AOIY | ALBERT OIL COMPANY INC | | | SCAC4 |
