| 1 | AK | Air Asia Sen Bhd. t/a Air Asia | ICAO: AXM, Callsign: Asian Express, IATA Prefix: 807, ICAO Callsign changed to Red Cap. Desginator AK reinstated by IATA | MAL | AVCODES |
| 2 | AK | Air Bridge Carriers Ltd. (ABC) | ICAO: ABR, Callsign: Airbridge, | GB | AVCODES |
| 3 | AK | Alfa Jet | ICAO: AJE, Callsign: Alpha Jet, Designator AK recalled by IATA | E | AVCODES |
| 4 | AK | Altair Airlines, Inc. | | USA | AVCODES |
| 5 | AK | Aerokontakt | Callsign: Aerokontakt, Designator AK recalled by IATA | S | AVCODES |
| 6 | AK | Air Asia Sen Bhd. t/a Air Asia | ICAO: AXM, Callsign: Red Cap, IATA Prefix: 807, ICAO Callsign changed from Asian Express. Desginator AK reinstated by IATA | MAL | AVCODES |
| 7 | AK | Autokraft GmbH | | D | TRAFFIC |
| 8 | AK | Adria kombi d.o.o., Ljubljana | | SI | VKM |
| 9 | AKA | Air Korea Co. Ltd. | | ROK | AVCODES |
| 10 | AKA | Air Korea Co. Ltd. | IATA: CD, Designator CD recalled by IATA | ROK | AVCODES |
| 11 | AKA | Alaska International Air, Inc. | IATA: BF, Callsign: Interalas, Name changed to Markair, Inc. | USA | AVCODES |
| 12 | AKA | Air Korea Co. Ltd. | | | ICAO1 |
| 13 | AKAB | AHISKA TRUCKING LLC | | | SCAC4 |
| 14 | AKAC | ADIMARK & CC TRANSPORT INC | | | SCAC4 |
| 15 | AKAD | A-KALALA TRUCKING LTD | | | SCAC4 |
| 16 | AKAE | ARK AIR EXPRESS | | | SCAC4 |
| 17 | AKAF | AIRKON AIR FREIGHT INC | | | SCAC3 |
| 18 | AKAF | Akaflieg | | D | TRAFFIC |
| 19 | AKAH | ALASKA HOMES | | | SCAC3 |
| 20 | AKAI | AKA INC | | | SCAC3 |
| 21 | AKAK | ALASKA AUTO TRANSPORT LLC | | | SCAC4 |
| 22 | AKAL | ALASKA AIRLINES (AIR CODE AS) | | | SCAC4 |
| 23 | AKAM | A K A TRUCKING COMPANY | | | SCAC3 |
| 24 | AKAN | ALASKAN EXPRESS SERVICE INC | | | SCAC4 |
| 25 | AKAN | Akan Bus | | J | TRAFFIC |
| 26 | AKAO | AKA TRANSPORTATION LLC | | | SCAC4 |
| 27 | AKAP | ATLANTSKA PLOVIDBA | | | SCAC3 |
| 28 | AKAP | ATLANTSKA PLOVIDBA | | | SCAC4 |
| 29 | AKAS | ANO KARDAMYLA SHIPPING SPECIAL MARI | | | SCAC4 |
| 30 | AKAT | AKA TRUCKING CO INC | | | SCAC4 |
| 31 | AKAU | PE ANYKIEIENKO KONSTIANTYN | | UA | BIC |
| 32 | AKAW | ALASKA AIR FORWARDING | | | SCAC4 |
| 33 | AKAY | ARK TRANSPORTATION INC | | | SCAC4 |
| 34 | AKB | Aktjubavia | Callsign: Karab, | KZ | AVCODES |
| 35 | AKB | Aktjubavia | | | ICAO1 |
| 36 | AKBG | ALASKA BARGE AND TRANSPORT INC | | | SCAC3 |
| 37 | AKBK | A K TRUCKING | | | SCAC4 |
| 38 | AKBL | ALASKA BARGE LINES INC | | | SCAC3 |
| 39 | AKBT | AKB TRANSPORT LLC | | | SCAC4 |
| 40 | AKBU | ALLNEX RESINS NETHERLANDS BV | | NL | BIC |
| 41 | AKBU | AKZO NOBEL RESINS BV | | | SCAC4 |
| 42 | AKBV | AROOSTOOK BEVERAGE COMPANY | | | SCAC3 |
| 43 | AKC | Arca Aerovias Colombianas Ltda. | IATA: ZU, Callsign: Arca, Ceased operations. | CO | AVCODES |
| 44 | AKC | Arca Aerovias Colombianas Ltda. | IATA: RH, Callsign: Arca, Designator RH recalled by IATA | CO | AVCODES |
| 45 | AKC | PT. Asialink Cargo Express | IATA: KP, Callsign: Asialink Cargo, IATA Prefix: 385, | RI | AVCODES |
| 46 | AKC | Arca Aerovias Colombianas Ltda. | | | ICAO1 |
| 47 | AKC | Arkansas Central R.R. Co. | 8/1920-7/1923 | | NAKINA |
| 48 | AKC | Arkansas Central R.R. Co. | 23-Jul | | NRHS |
| 49 | AKC | ARKANSAS CENTRAL RAILROAD | | | PWRC |
| 50 | AKC | Arkansas Central Railroad | | | RSRV |
| 51 | AKCC | AHALT, R K TRUCKING | | | SCAC4 |
| 52 | AKCE | ALASKA CENTRAL EXPRESS | | | SCAC4 |
| 53 | AKCG | ALFONS KOSTER & CO GMBH | | | SCAC4 |
| 54 | AKCI | AKRON-CANTON INTERNATIONAL FORWARDI | | | SCAC3 |
| 55 | AKCI | AMBER TRUCKING COMPANY OF ILLINOIS | | | SCAC4 |
| 56 | AKCK | AKINS, CALVIN K | | | SCAC3 |
| 57 | AKCL | ALASKA CARGO LINES | | | SCAC3 |
| 58 | AKCM | ARKCOM INC | | | SCAC3 |
| 59 | AKCN | AKRON CORPORATION | | | SCAC3 |
| 60 | AKCO | ATLANTIA TANKER CORPORATION | | | SCAC3 |
| 61 | AKCO | ATLANTIA TANKER CORPORATION | | | SCAC4 |
| 62 | AKCP | ATLANTIA TANKER CORPORATION | | | SCAC3 |
| 63 | AKCR | ARKANSAS CARRIERS CORPORATION | | | SCAC3 |
| 64 | AKCS | ALASKA COAST TRANSPORT INC | | | SCAC3 |
| 65 | AKCS | ALASKA COAST TRANSPORT INC | | | SCAC4 |
| 66 | AKCT | ALASKA CARGO TRANSPORT INC | | | SCAC3 |
| 67 | AKCT | ALASKA CARGO TRANSPORT INC | | | SCAC4 |
| 68 | AKCU | AK CHEMIE GMBH & CO. KG | | | SCAC3 |
| 69 | AKCU | AK CHEMIE GMBH & CO. KG | | | SCAC4 |
| 70 | AKCV | ACS | | | SCAC4 |
| 71 | AKCW | AROUKA TANKER CORP | | | SCAC4 |
| 72 | AKD | Alfa KR | Callsign: Alfa Asia, | KS | AVCODES |
| 73 | AKD | Akdeniz Airlines | Callsign: Akdeniz Airlines, Founded in 1995. Commenced operations in June 1995. Ceased operations in December 1995. | TR | AVCODES |
| 74 | AKDB | ALASKA DIRECT BUS LINE | | | SCAC3 |
| 75 | AKDB | ALASKA DIRECT BUS LINES INC | | | SCAC4 |
| 76 | AKDC | ATKINSON DISTRIBUTING INC | | | SCAC4 |
| 77 | AKDH | ACKLAND, DUANE H | | | SCAC3 |
| 78 | AKDN | Acadiana Ry. Co. | 1/1994-7/2005 | | NAKINA |
| 79 | AKDN | Acadiana Ry. Co. | 1/94-7/2000 | | NRHS |
| 80 | AKDN | ACADIANA RAILWAY COMPANY | | | PWRC |
| 81 | AKDN | Acadiana Railway | | | RSRV |
| 82 | AKDN | ACADIANA RAILWAY COMPANY | | | SCAC3 |
| 83 | AKDN | ACADIANA RAILWAY COMPANY | | | SCAC4 |
| 84 | AKDT | ALASKA DIRECT TRANSPORT, INC | | | SCAC3 |
| 85 | AKDT | ALASKA DIRECT TRANSPORT INC | | | SCAC4 |
| 86 | AKE | Air Maken | Callsign: Air Maken, | GQ | AVCODES |
| 87 | AKE | AKE Eisenbahntouristik | | D | TRAFFIC |
| 88 | AKEI | AKE TRANSPORTATION COMPANY INC | | | SCAC3 |
| 89 | AKEL | AK EXPRESS TRANSPORTATION LLC | | | SCAC4 |
| 90 | AKEN | AKENS MOVING AND STORAGE INC | | | SCAC3 |
| 91 | AKEN | ALASKA EXCURSIONS | | | SCAC4 |
| 92 | AKEP | A K EXPEDITE LTD | | | SCAC4 |
| 93 | AKER | AKERS MOTORS LINE INC | | | PWRC |
| 94 | AKER | AKERS TRUCKING LLC | | | SCAC4 |
| 95 | AKES | AKES TRANSPORTATION COMPANY | | | SCAC3 |
| 96 | AKET | AKE & R TRUCKING CORP | | | SCAC4 |
| 97 | AKF | Aero Monbasa | Callsign: African Falcon, Name changed from Gulf Falcon Air Services Limited | EAK | AVCODES |
| 98 | AKF | Gulf Falcon Air Services Limited | Callsign: African Falcon, Name changed to Aero Monbasa | EAK | AVCODES |
| 99 | AKF | Aero Asahi Corporation | | J | AVCODES |
| 100 | AKF | Anikay Air Company | | | ICAO1 |
