| 1 | AJ | Air Belgium International | ICAO: ABB, Callsign: Air Belgium, Sold to Airtours and operations ceased by end October 2000. IATA designator changed from VY | B | AVCODES |
| 2 | AJ | Air-Lift Associtaes, Inc. d/b/a Air-Lift Commuter | | USA | AVCODES |
| 3 | AJ | Aero Contractors Company of Nigeria Ltd. | ICAO: NIG, Callsign: Aeroline, Name changed to Aero Contractors Nigeria Limited. IATA Designator changed from NU* | WAN | AVCODES |
| 4 | AJ | Aerovias Internacional Balboa, S.A. | | PA | AVCODES |
| 5 | AJ | Aero Filipinas, Inc. | ICAO: AFI, Callsign: Alpha Juliett, | RP | AVCODES |
| 6 | AJ | Aero Contractors Nigeria Limited | ICAO: NIG, Callsign: Aeroline, IATA Prefix: 914, Name changed from Aero Contractors Company of Nigeria Ltd. IATA Designator changed from NU* | WAN | AVCODES |
| 7 | AJ | Aztec Worldwide Airlines, Inc. | ICAO: WWA, Callsign: Aztec World, IATA Prefix: 179, ICAO designator changed to AZY. Name changed from Piper Aztec Inc, d/b/a Aztec Airways. Designator changed from 7A* | USA | AVCODES |
| 8 | AJ | Aztec Worldwide Airlines, Inc. | ICAO: AZY, Callsign: Aztec World, IATA Prefix: 179, ICAO designator changed from WWA. Name changed from Piper Aztec Inc, d/b/a Aztec Airways. Designator changed from 7A* | USA | AVCODES |
| 9 | AJ | Alma & Jonquieres Ry. Co. | 7/1954-4/1970; eliminated 4/1974 | | NAKINA |
| 10 | AJ | Alma & Jonquieres Ry. Co. | 10/57-4/70; eliminated 4/74 | | NRHS |
| 11 | AJ | ALMA & JONQUIERES RY. | | | PWRC |
| 12 | AJ | Alma and Jonquieres Railway | | | RSRV |
| 13 | AJ | Alma & Jonquieres Ry. Co. | | USA | TRAFFIC |
| 14 | AJA | A J Services Limited | Callsign: Ayjay Services, | GB | AVCODES |
| 15 | AJA | Al Jaber Aviation | | UAE | AVCODES |
| 16 | AJA | Afghan Jet International Airlines | Callsign: Afghan Jet, Ceased operations on 15 June 2016. | AFG | AVCODES |
| 17 | AJA | A J Services | | | ICAO1 |
| 18 | AJAC | AJ & COMPANY | | | SCAC3 |
| 19 | AJAC | AJAXTEL INC | | | SCAC4 |
| 20 | AJAE | A J AIR EXPRESS | | | SCAC3 |
| 21 | AJAE | AUTOTRANSPORTES LA JARRITA SA DE CV | | | SCAC4 |
| 22 | AJAF | AJA FORWARDING COMPANY | | | SCAC3 |
| 23 | AJAG | AGUILAR, JOSE ANGEL | | | SCAC4 |
| 24 | AJAK | ARPIN VAN LINES INC (ARPIN OF JACKS | | | SCAC4 |
| 25 | AJAM | ALEMANY-MARTI J A INC, MAYAGUEZ PR | | | SCAC3 |
| 26 | AJAP | A J & ASSOCIATES LLC | | | SCAC4 |
| 27 | AJAQ | AJAX WAREHOUSE INC | | | SCAC3 |
| 28 | AJAX | Agramericas, Inc. | added 7/2007 | | NAKINA |
| 29 | AJAX | Ajax Transportation Co., Inc. | 7/1937-1/1943 | | NAKINA |
| 30 | AJAX | Ajax Tank Car Co. | 7/1930-7/1932 | | NAKINA |
| 31 | AJAX | Ajax Transportation Co., Inc. | Apr-38 | | NRHS |
| 32 | AJAX | *AJAX TRANSPORTATION CO. [AJAX TANK CAR CO.] | | | PWRC |
| 33 | AJAX | +AGRAMERICAS, INC. | | | PWRC |
| 34 | AJAX | AJAX TRANS CO, INC | | | SCAC3 |
| 35 | AJB | Aero JBR, S.A. de C.V. | Callsign: Aero JBR, | MEX | AVCODES |
| 36 | AJB | American Jet S.A. | Callsign: Amjet, | RA | AVCODES |
| 37 | AJB | Aero JBR | | | ICAO1 |
| 38 | AJBC | ALIMENTS JOLIBEC INC | | | SCAC3 |
| 39 | AJBL | A J BUS LINES-MICHIGAN LTD | | | SCAC3 |
| 40 | AJBS | ANDERSON, J B & SON | | | SCAC3 |
| 41 | AJBS | AJ TRANSPORTATION | | | SCAC4 |
| 42 | AJC | Bar Harbor Airlines | Callsign: Bar Harbor, Ceased operations in March 1991. | USA | AVCODES |
| 43 | AJC | Bar Harbor Airlines | | | ICAO1 |
| 44 | AJCC | A & J CARTAGE COMPANY | | | SCAC3 |
| 45 | AJCC | A & J CARTAGE COMPANY | | | SCAC4 |
| 46 | AJCF | AJC INTERNATIONAL INC | | | SCAC4 |
| 47 | AJCH | AJC ENTERPRISES | | | SCAC4 |
| 48 | AJCI | A J C AIR FREIGHT INC | | | SCAC3 |
| 49 | AJCK | A J TRUCKING INC | | | SCAC3 |
| 50 | AJCK | AJW TRANSPORTATION LLC | | | SCAC4 |
| 51 | AJCL | AJC LOGISTICS LLC | | | SCAC4 |
| 52 | AJCM | ASCH, J C MOVERS INC | | | SCAC3 |
| 53 | AJCM | AJ'S OAK EXPRESS | | | SCAC4 |
| 54 | AJCN | AMERISTAR JET CHARTER INC | | | SCAC4 |
| 55 | AJCO | AJC INTERNATIONAL INC | | | SCAC4 |
| 56 | AJCP | AUSTIN, JAMES COMPANY | | | SCAC4 |
| 57 | AJCQ | AVERY, J CONSOLIDATION WHSE & DISTR | | | SCAC3 |
| 58 | AJCR | A J CARGO INC | | | SCAC3 |
| 59 | AJCS | ACC JEWELRY CREATIONS | | | SCAC4 |
| 60 | AJCU | AUSTRALIA JAPAN CONTAINER LINE | | | PWRC |
| 61 | AJCU | Australia Japan Container Line | | | RSRV |
| 62 | AJCU | AUSTRALIA JAPAN CONTAINER LINE | | | SCAC3 |
| 63 | AJCU | P & O NEDLLOYD BV | | | SCAC4 |
| 64 | AJCY | ATKINSON, JERRY COMPANY | | | SCAC4 |
| 65 | AJD | Vista Georgia Ltd. | IATA: GT, Callsign: Vista Georgia, Commenced operations on 05 August 2014. Ceased operations in May 2015. | GE | AVCODES |
| 66 | AJDC | ARNOLD, J D CARTAGE INC | | | SCAC3 |
| 67 | AJDC | AJD TRANSPORT | | | SCAC4 |
| 68 | AJDQ | A J D CARTAGE | | | SCAC3 |
| 69 | AJDT | A J D TRANSPORT | | | SCAC3 |
| 70 | AJE | Alfa Jet | IATA: AK, Callsign: Alpha Jet, Designator AK recalled by IATA | E | AVCODES |
| 71 | AJE | Alfa Jet | Callsign: Alpha Jet, Formerly Delta Jet SA | E | AVCODES |
| 72 | AJE | Aero Jet Express, S.A. de C.V. | Callsign: Jet Express, | MEX | AVCODES |
| 73 | AJE | Aero Jet Express | | | ICAO1 |
| 74 | AJEF | ANDERSON, JEFFERY TRUCKING INC | | | SCAC3 |
| 75 | AJEF | ANDERSON, JEFFERY TRUCKING INC | | | SCAC4 |
| 76 | AJEI | ANDERSON, JAMES ERNEST | | | SCAC3 |
| 77 | AJEL | A & J EXPRESS LLC | | | SCAC4 |
| 78 | AJEN | A J ENTERPRISES | | | SCAC4 |
| 79 | AJEQ | A-JACKS EQUIPMENT & RENTAL | | | SCAC3 |
| 80 | AJEQ | A-J ENTERPRISES | | | SCAC4 |
| 81 | AJES | ASPEN, J E SHIPPING COMPANY | | | SCAC3 |
| 82 | AJF | Avia Consult Flugbetriebs GmbH | Callsign: Aviaconsult, | A | AVCODES |
| 83 | AJF | Avia Consult Flugbetriebs | | | ICAO1 |
| 84 | AJF | Arvidsjaurs Järnvägsförening | | SE | VKM |
| 85 | AJFA | A & J FARMS INC | | | SCAC4 |
| 86 | AJFC | AJF CONSOLIDATORS COMPANY | | | SCAC3 |
| 87 | AJFD | AJF DISTRIBUTION SYSTEMS | | | SCAC3 |
| 88 | AJFE | A J F ENTERPRISES INC | | | SCAC3 |
| 89 | AJFI | AJF WAREHOUSING (A DIVISION OF AJF | | | SCAC3 |
| 90 | AJFJ | A & J FREIGHT | | | SCAC4 |
| 91 | AJFK | ATLANTIC FREIGHT JFK | | | SCAC4 |
| 92 | AJFM | A J F OF MANTUA INC | | | SCAC3 |
| 93 | AJFM | A & J FARMS INC (MAXI FLATBED DIV) | | | SCAC4 |
| 94 | AJFN | AJF INC | | | SCAC4 |
| 95 | AJFW | AJF WAREHOUSE DISTRIBUTORS INC | | | SCAC3 |
| 96 | AJGM | ALEJANDRO GARZA, MARTE | | | SCAC4 |
| 97 | AJGP | A & J TRANSPORT GROUP | | | SCAC4 |
| 98 | AJGT | A J G TRUCKING INC | | | SCAC4 |
| 99 | AJH | Aeroaljarafe S.L. | Callsign: Aljarafe, | E | AVCODES |
| 100 | AJHA | ALLEN, JOHN A INC | | | SCAC3 |
