| 12601 | AROX | General American Transportation Corp. | 4/1970-1/1980; eliminated 1/1988; 1/1994-7/2005 (not listed) | | NAKINA |
| 12602 | AROX | Air Reduction Co., Inc. (General American Transportation Corp.) | 10/1966 | | NAKINA |
| 12603 | AROX | General American Transportation Corp. | 1/1952-7/1965 | | NAKINA |
| 12604 | AROX | Arro Oil & Refining Co. | 7/1935-1/1941 | | NAKINA |
| 12605 | AROX | Arro Oil & Refining Co. | Apr-38 | | NRHS |
| 12606 | AROX | General American Transportation Corp. | 1/52-7/65 | | NRHS |
| 12607 | AROX | Air Reduction Co., Inc. (General American Transportation Corp.) | Oct-66 | | NRHS |
| 12608 | AROX | General American Transportation Corp. | 4/70-1/80; eliminated 1/88; 1/94-7/2000 | | NRHS |
| 12609 | AROX | *ARRO OIL & REFINING CO. | | | PWRC |
| 12610 | AROX | +GATX [AIR REDUCTION CO.] | | | PWRC |
| 12611 | AROX | Arro Oil & Refining (GATX Corporation) | | | RSRV |
| 12612 | AROX | AIR REDUCTION CO INC | | | SCAC3 |
| 12613 | AROY | AROUND THE CLOCK TRANSPORT INC | | | SCAC4 |
| 12614 | AROZ | AGROCK | | | PWRC |
| 12615 | ARP | Société D’Exploitation Aeropostale | Callsign: Aeroposte, Designator 5S recalled by IATA. Designator 5S reinstated by IATA | F | AVCODES |
| 12616 | ARP | Société D’Exploitation Aeropostale | IATA: 5S, Callsign: Aeroposte, Designator 5S recalled by IATA | F | AVCODES |
| 12617 | ARP | Société D’Exploitation Aeropostale | Callsign: Aeroposte, Designator 5S recalled by IATA. Designator 5S reinstated by IATA | F | AVCODES |
| 12618 | ARP | RPA-Aviataxi Ltd. | | RUS | AVCODES |
| 12619 | ARP | RPA-Aviataxi Ltd. | | | ICAO1 |
| 12620 | ARP | ARRIVA RP Sp. z o.o. | | PL | VKM |
| 12621 | ARPA | ARPEZA TRANSPORTES | | | SCAC4 |
| 12622 | ARPA | Autolinee Regionali Pubbliche Abruzzesi | City: Chieti | I | TRAFFIC |
| 12623 | ARPB | A & R TRANSPORT INC | | | SCAC3 |
| 12624 | ARPB | A & R TRANSPORT INC | | | SCAC4 |
| 12625 | ARPD | ALLEGHENY RECYCLED PRODUCTS | | | SCAC4 |
| 12626 | ARPE | A R TRANSPORT INC | | | SCAC3 |
| 12627 | ARPE | ARPEZ SA | | | SCAC4 |
| 12628 | ARPF | ARP TRANSPORT LLC | | | SCAC4 |
| 12629 | ARPG | ARPIN OF MICHIGAN | | | SCAC4 |
| 12630 | ARPH | ARAPAHO SHIPPING CORP OF MONROVIA | | | SCAC3 |
| 12631 | ARPH | ARMTEC LIMITED PARTNERSHIP | | | SCAC4 |
| 12632 | ARPI | ALPHA RECYCLING INC | | | SCAC3 |
| 12633 | ARPK | ARIA PETROLEUM INC | | | SCAC4 |
| 12634 | ARPL | Arriva Polska | | PL | TRAFFIC |
| 12635 | ARPM | ART & PAUL MOVING AND STORAGE | | | SCAC4 |
| 12636 | ARPO | A-ONE (A-1) TRANSPORT | | | SCAC4 |
| 12637 | ARPP | ARROW PAPER CO INC | | | SCAC3 |
| 12638 | ARPP | ASARP TRUCKING LLC | | | SCAC4 |
| 12639 | ARPQ | AIRPORT EXPEDITING SERVICE INC | | | SCAC3 |
| 12640 | ARPS | AIRPORT LIMOUSINE SERVICE | | | SCAC3 |
| 12641 | ARPT | AIRPORT TRANSPORTATION COMPANY | | | SCAC4 |
| 12642 | ARPU | EQUIPOS MOVILES DE CAMPANA ARPA S.A.U. | | E | BIC |
| 12643 | ARPU | EQUIPOS MOVILES DE CAMPANA ARPA S A | | | SCAC4 |
| 12644 | ARPV | ARPIN, PAUL VAN LINES INC | | | SCAC3 |
| 12645 | ARPV | ARPIN VAN LINES INC | | | SCAC4 |
| 12646 | ARPW | AL-AMIN BROTHERS TRANSPORTATION LLC | | | SCAC4 |
| 12647 | ARPX | BP Products North America Inc. | added 1/2003; 7/2005 | | NAKINA |
| 12648 | ARPX | Amoco Oil Co. | added 7/2000; 7/2000; eliminated 1/2003 | | NAKINA |
| 12649 | ARPX | Arco Products Co. | eliminated 7/2000 | | NAKINA |
| 12650 | ARPX | Arco Products Co., Division of Atlantic Richfield Co. | added 1/1989; 1/1994 | | NAKINA |
| 12651 | ARPX | Arco Petroleum Products Co., Division of Atlantic Richfield Co. | added 4/1980; eliminated 1/1989 | | NAKINA |
| 12652 | ARPX | ARCO Petroleum Co.-Division of Atlantic Richfield Co. | added 1/1980; 1/1980; eliminated 4/1980 | | NAKINA |
| 12653 | ARPX | A.R.P. Leasing Corp. | added 4/1971; 1/1975; eliminated 4/1977 | | NAKINA |
| 12654 | ARPX | A.R.P. Leasing Corp. | added 4/71; 1/75 | | NRHS |
| 12655 | ARPX | ARCO Petroleum Co.-Division of Atlantic Richfield Co. | added 1/80; 1/80; eliminated 4/80 | | NRHS |
| 12656 | ARPX | Arco Petroleum Products Co., Division of Atlantic Richfield Co. | added 4/80; eliminated 1/89 | | NRHS |
| 12657 | ARPX | Arco Products Co., Division of Atlantic Richfield Co. | added 1/89; 1/94 | | NRHS |
| 12658 | ARPX | Arco Products Co. | eliminated 7/2000 | | NRHS |
| 12659 | ARPX | Amoco Oil Co. | added 7/2000; 7/2000 | | NRHS |
| 12660 | ARPX | *A.R.P. LEASING | | | PWRC |
| 12661 | ARPX | +ARCO PRODUCTS CO., DIV OF BP PRODUCTS NORTH AMERICA [ATLANTIC RICHFIELD; AMOCO OIL CO.] | | | PWRC |
| 12662 | ARPX | Arco Petroleum Products (BP Products North America) | | | RSRV |
| 12663 | ARPX | BP PRODUCTS NORTH AMERICA INC | | | SCAC4 |
| 12664 | ARPY | AMERICAN TRANSPORT LINES INC. | | | SCAC4 |
| 12665 | ARPZ | ALABAMA RIVER PLANT | | | PWRC |
| 12666 | ARQ | Armstrong Air, Inc. | Callsign: Armstrong, | CDN | AVCODES |
| 12667 | ARQ | Ark Airways LLC | IATA: ZQ, Callsign: Ark Airways, IATA Prefix: 327, Founded in 2010. Ceased operations. | AM | AVCODES |
| 12668 | ARQ | Airco Aircraft Charters Ltd. | Callsign: Airco, | CDN | AVCODES |
| 12669 | ARQ | Armstrong Air, Inc. | | | ICAO1 |
| 12670 | ARQA | A R M & ASSOCIATES | | | SCAC3 |
| 12671 | ARQA | ARA TRANSPORT LLC | | | SCAC4 |
| 12672 | ARQB | ARBOR OIL LLC | | | SCAC4 |
| 12673 | ARQC | ATLANTIC REEFER CORP | | | SCAC3 |
| 12674 | ARQC | ARQUITECTURA EN GRANITO Y MARMOL SA | | | SCAC4 |
| 12675 | ARQE | ARI LOGISTICS LLC (VARNEDOE) | | | SCAC4 |
| 12676 | ARQF | AIR & ROAD LOGISTICS LLC | | | SCAC4 |
| 12677 | ARQG | ARMS TRUCKING CO, THE | | | SCAC4 |
| 12678 | ARQH | ACR COACH | | | SCAC4 |
| 12679 | ARQI | ARES CONTAINER LINE INC LOS ANGELES | | | SCAC3 |
| 12680 | ARQI | ALLROUND LOGISTICS INC | | | SCAC4 |
| 12681 | ARQJ | ARTEL TRUCKING CORP | | | SCAC4 |
| 12682 | ARQL | ARIES TRANSPORT CO LTD MONROVIA LIB | | | SCAC3 |
| 12683 | ARQL | ARI LOGISTICS LLC | | | SCAC4 |
| 12684 | ARQM | ARNELL MOTOR COMPANY | | | SCAC3 |
| 12685 | ARQM | ACE ROTO-MOLD | | | SCAC4 |
| 12686 | ARQN | ARAN TRADING LTD | | | SCAC4 |
| 12687 | ARQO | ARTS CART | | | SCAC3 |
| 12688 | ARQP | AMERICAN TRANSPORT CORP | | | SCAC3 |
| 12689 | ARQR | AIRPORT CONNECTIONS INC | | | SCAC4 |
| 12690 | ARQT | ARNDT TRUCKING INC | | | SCAC3 |
| 12691 | ARQT | ARTESANIAS | | | SCAC4 |
| 12692 | ARQU | AROCON (MARINE) LTD. | | | SCAC3 |
| 12693 | ARQV | ARK DISPATCH SERVICES | | | SCAC4 |
| 12694 | ARQW | ARTIC SHIPPING COMPANY | | | SCAC3 |
| 12695 | ARR | Aerora, S.A. | Callsign: Aerora, | MEX | AVCODES |
| 12696 | ARR | Air Armenia CJSC | IATA: QN, Callsign: Air Armenia, IATA Prefix: 907, Ceased operations on 29 October 2014. | AM | AVCODES |
| 12697 | ARR | Air Armenia | IATA: QN | | ICAO1 |
| 12698 | ARR | Alaska R.R. Corp. | added 4/1985; 1/1994-7/2005 | | NAKINA |
| 12699 | ARR | Alaska R.R. | 7/1965-1/1980; eliminated 4/1985 | | NAKINA |
| 12700 | ARR | Alaska R.R. | 7/65-1/80; eliminated 4/85 | | NRHS |
