| 1 | AP | Air One | ICAO: ADH, Callsign: Heron, IATA Prefix: 867, Merged into Alitalia on 30 October 2014. Name changed from Aliadriatica w.e.f. 23 November 1995. | I | AVCODES |
| 2 | AP | Aliadriatica | ICAO: ADH, Founded in November 1983. Name changed to Air One w.e.f. 23 November 1995. | I | AVCODES |
| 3 | AP | B.I.A.S. overseas NV | | B | AVCODES |
| 4 | AP | Belgiun International Air Services Cy. | Callsign: Bias, Name changed to B.I.A.S. overseas | B | AVCODES |
| 5 | AP | Aspen Airways, Inc. | ICAO: ASP, Callsign: Aspen Air, Ceased operations on 01 April 1990 when parts where merged into Mesa Airlines and Air Wisconsin. | USA | AVCODES |
| 6 | AP | Flugdienst Pegasus | Callsign: Air Pegasus, | D | AVCODES |
| 7 | AP | Alba Star, S.A. d/b/a Alba Star.es | ICAO: LAV, Callsign: Albastar, IATA Prefix: 374, IATA designator changed from JQ*. | E | AVCODES |
| 8 | AP | Amoníacos de Portugal, SA | | PT | VKM |
| 9 | APA | Air Park Aviation Ltd. | Callsign: Can-Am, | CDN | AVCODES |
| 10 | APA | Air Park Aviation Ltd. | | | ICAO1 |
| 11 | APA | Apache Ry. Co. | 1/1975-7/2005 | | NAKINA |
| 12 | APA | Apache Ry. Co. | 1/75-7/2000 | | NRHS |
| 13 | APA | APACHE RAILWAY COMPANY | | | PWRC |
| 14 | APA | Apache Railway | | | RSRV |
| 15 | APA | APACHE RAILWAY COMPANY | | | SCAC4 |
| 16 | APA | Apache Railway Company | | USA | TRAFFIC |
| 17 | APAA | APEXNORTH LLC | | | SCAC4 |
| 18 | APAB | A P A INTERMODAL | | | SCAC4 |
| 19 | APAC | A-P-A TRANSPORT CORP | | | SCAC3 |
| 20 | APAC | AG PARTNERS COOP | | | SCAC4 |
| 21 | APACSA | Apacsa Agrolineas del Pacifico SA | | EC | TRAFFIC |
| 22 | APAD | AMERICAN PRESIDENT AUTOMOTIVE DISTR | | | SCAC3 |
| 23 | APAD | APL LOGISTICS TRANSPORTATION MANAGE | | | SCAC4 |
| 24 | APAE | APACHE EXPRESS LTD | | | SCAC3 |
| 25 | APAF | ASIAN PACIFIC EXPRESS INC. | | | SCAC3 |
| 26 | APAF | AMERICA PLUS BROKERAGE INC | | | SCAC4 |
| 27 | APAH | APACHE TANKER CORP OF MONROVIA LIB | | | SCAC3 |
| 28 | APAI | ATLANTIC PACIFIC TRUCKING | | | SCAC3 |
| 29 | APAI | APOSTLES OF INFINITE LOVE, THE | | | SCAC4 |
| 30 | APAJ | ADAPT TRANSPORT CORP | | | SCAC4 |
| 31 | APAL | ALLIANCE PASTEX LLC | | | SCAC4 |
| 32 | APAM | APACE MOVING SYSTEMS INC | | | SCAC3 |
| 33 | APAM | Apam Esercizio SpA | City: Mantova | I | TRAFFIC |
| 34 | APAN | APACA INC | | | SCAC3 |
| 35 | APAN | APACA MOVING & STORAGE INC | | | SCAC4 |
| 36 | APAO | APPLE AUTO SALES | | | SCAC3 |
| 37 | APAO | ALPENA OIL CO INC | | | SCAC4 |
| 38 | APAP | ASPEN APPLIANCE INSTALLATION INC | | | SCAC3 |
| 39 | APAQ | AMPAC TRANSPORTATION INC | | | SCAC4 |
| 40 | APAR | APOLLO AIR LOGISTICS | | | SCAC3 |
| 41 | APAS | ARPIN, PAUL & SONS STORAGE WAREHOUS | | | SCAC3 |
| 42 | APAT | AUTO PURCHASING AGENCY, INC | | | SCAC3 |
| 43 | APAT | ALPINE AEROTECH LTD | | | SCAC4 |
| 44 | APAU | APR ENERGY LLC | | USA | BIC |
| 45 | APAU | APR Energy | | | RSRV |
| 46 | APAV | AIMPACIFIC SERVICES INC | | | SCAC4 |
| 47 | APAW | A-P-A WORLD TRANSPORT CORP | | | SCAC3 |
| 48 | APAW | AUTUMN TRANSPORT LTD | | | SCAC4 |
| 49 | APAX | Cementos Apasco S.A. de C.V. | 7/2000-7/2005 (not listed) | | NAKINA |
| 50 | APAX | Associated Packers, Inc. | 7/1932 | | NAKINA |
| 51 | APAX | West Penn Power Co. | added 1/1976; 1/1980-1/1994; eliminated 7/1995 | | NAKINA |
| 52 | APAX | West Penn Power Co. | 1/80-1/94; eliminated 7/95 | | NRHS |
| 53 | APAX | Cementos Apasco S.A. de C.V. | Jul-00 | | NRHS |
| 54 | APAX | *ASSOCIATED PACKERS, INC. | | | PWRC |
| 55 | APAX | *WEST PENN POWER CO. | | | PWRC |
| 56 | APAX | +CEMENTOS APASCO S.A. de C.V. | | | PWRC |
| 57 | APAX | Associated Packers (Cementos Apasco) | | | RSRV |
| 58 | APAX | CEMENTOS APASCO SA DE CV | | | SCAC4 |
| 59 | APAXX | Associated Packers (Cementos Apasco) | | | RSRV |
| 60 | APAY | ALPHA SHIPPING AGENCY INC | | | SCAC3 |
| 61 | APB | Air Atlantique / Air Publicité | IATA: 4Q, Callsign: Charente, Declared bankruprcy on 06 April 2004. Designator KI recalled by IATA | F | AVCODES |
| 62 | APB | Air Atlantique / Air Publicité | IATA: KI, Callsign: Charente, Designator KI recalled by IATA | F | AVCODES |
| 63 | APB | Aviopiva | Callsign: Aviopiva, Founded in 2004. Ceased operations in 2006. | BIH | AVCODES |
| 64 | APB | Air Atlantique / Air Publicité | | F | AVCODES |
| 65 | APB | Aalborg Privatbaner | 1917 - 1969 | DK | jernbanen.dk |
| 66 | APB | Aalborg Privatbaner | 1917 - 1969 | DK | TRAFFIC |
| 67 | APBA | A PLUS TRANSPORT | | | SCAC4 |
| 68 | APBB | A & P TRANSPORTATION OF SJ INC | | | SCAC4 |
| 69 | APBC | APPLE COMMUTER INC | | | SCAC3 |
| 70 | APBD | APACHE STAINLESS EQUIPMENT | | | SCAC4 |
| 71 | APBF | APODACA BROS INC | | | SCAC4 |
| 72 | APBG | AMERICAN PORTABLE BUILDINGS CORPORA | | | SCAC3 |
| 73 | APBG | AMERICA BEST TRANSPORT INC | | | SCAC4 |
| 74 | APBI | ALKOR SHIPPING CORP | | | SCAC4 |
| 75 | APBK | AMERICAN PIGGYBACK SERVICES INC | | | SCAC3 |
| 76 | APBK | ARIES LOGISTICS LP | | | SCAC4 |
| 77 | APBL | APPLE BLOSSOM CHARTER | | | SCAC3 |
| 78 | APBL | ABN - PLAINFIELD TRUCKING LLC | | | SCAC4 |
| 79 | APBM | ATKINS-PARKER BROS MOVING | | | SCAC3 |
| 80 | APBO | ADAMS, PAUL | | | SCAC4 |
| 81 | APBS | APPLIED BLASTING SERVICES | | | SCAC3 |
| 82 | APBS | ALEXANDRIA PROFESSIONAL BODY SUGARI | | | SCAC4 |
| 83 | APBT | APOLLO BOCK TRAVEL | | | SCAC3 |
| 84 | APBW | ALL POINT LOGISTICS LLC | | | SCAC4 |
| 85 | APBY | APPLEBY TRANSPORTATION LTD | | | SCAC3 |
| 86 | APBY | APPLEBY TRANSPORTATION LTD | | | SCAC4 |
| 87 | APC | Airpac Airlines, Inc. | IATA: LQ, Callsign: Airpac, Designator LQ* recalled by IATA | USA | AVCODES |
| 88 | APC | Airpac Airlines, Inc. | Callsign: Airpac, Designator LQ* recalled by IATA | USA | AVCODES |
| 89 | APC | Airpac Airlines, Inc. | | | ICAO1 |
| 90 | APCA | APACHE CARRIERS, THE | | | SCAC3 |
| 91 | APCA | AMBERMAR PRODUCT CARRIER CORPORATIO | | | SCAC4 |
| 92 | APCB | AIRPORT CONNECTION II INC, THE | | | SCAC3 |
| 93 | APCC | *ALL POINTS CONTAINER CORP. | | | PWRC |
| 94 | APCC | *ARKANSAS PORTLAND CEMENT CORP. | | | PWRC |
| 95 | APCC | ALL POINTS CONTAINER CORP | | | SCAC3 |
| 96 | APCC | ALL POINTS CONTAINER CORP | | | SCAC4 |
| 97 | APCD | AIRPORT COURIERS INC | | | SCAC3 |
| 98 | APCE | AMERICAN PACIFIC EXPRESS INC | | | SCAC3 |
| 99 | APCF | APACHE LINES INC | | | SCAC3 |
| 100 | APCF | ALTA PACIFIC TRANSPORT LTD | | | SCAC4 |
