| 1 | AL | Astral Aviation Inc. d/b/a Skyway Airlines | ICAO: SYX, Callsign: Skyway-Ex, Name changed to Skyway Airlines, Inc. d/b/a Midwest Connect | USA | AVCODES |
| 2 | AL | Allegheny Commuter Airlines, Inc. d/b/a USAir Express | ICAO: ALO, Callsign: Allegheny, IATA Designator changed to US | USA | AVCODES |
| 3 | AL | Allegheny Airlines, Inc. | ICAO: ALO, Callsign: Allegheny, Name changed to Allegheny Commuter Airlines, Inc. d/b/a USAir Express in 1979. | USA | AVCODES |
| 4 | AL | Skyway Airlines, Inc. d/b/a Midwest Connect | ICAO: SYX, Callsign: Skyway-Ex, Founded in 1994. Ceased operations in April 2008. Name changed from Astral Aviation Inc. d/b/a Skyway Airlines | USA | AVCODES |
| 5 | AL | Destination Airlink Bahamas Ltd | ICAO: DLB, Callsign: Airlink Bahamas, | BS | AVCODES |
| 6 | AL | Air Leisure Egypt | ICAO: ALD, Callsign: Air Leisure, Suspended operations on 22 October 2018. Founded in 2014. | ET | AVCODES |
| 7 | AL | MAAT Ltd t/a Malta Air | ICAO: MAY, Callsign: Blue Med, Name changed to Malta Air Limited. Ryanair Holdings Group | M | AVCODES |
| 8 | AL | Malta Air Limited | ICAO: MAY, Callsign: Blue Med, Name changed from MAAT Ltd t/a Malta Air. Ryanair Holdings Group | M | AVCODES |
| 9 | AL | Almanor R.R. Co. | 1/1975-1/1985; eliminated 10/1989; 1/1994-7/2005 | | NAKINA |
| 10 | AL | Almanor R.R. Co. | 1/75-1/80; eliminated 10/89; 1/94-7/2000 | | NRHS |
| 11 | AL | Augsburger Localbahn GmbH | Augsburg | D | privat-bahn.de |
| 12 | AL | ALMANOR RAILROAD | | | PWRC |
| 13 | AL | Almanor Railroad | | | RSRV |
| 14 | AL | ALMANOR RAILROAD COMPANY | | | SCAC4 |
| 15 | AL | Chemins de fer d'Alsace-Lorraine | | F | TRAFFIC |
| 16 | AL&G | Arkansas, Lousiana & Gulf Ry. Co. | 8/1920 | | NAKINA |
| 17 | AL&G | ARKANSAS, LOUISIANA & GULF RY. CO. | | | PWRC |
| 18 | AL&G | Arkansas, Louisiana and Gulf Railway | | | RSRV |
| 19 | AL&S | Alton & Southern R.R. | 8/1920-10/1966 | | NAKINA |
| 20 | AL&S | Alton & Southern R.R. | 7/23-10/66 | | NRHS |
| 21 | AL&S | ALTON & SOUTHERN RAILROAD | | | PWRC |
| 22 | ALA | Albion Aviation | Callsign: Albion, | GB | AVCODES |
| 23 | ALA | ALABAMA & GULF COAST RAILWAY | | | PWRC |
| 24 | ALAA | ALAMO AMBULANCE SERVICE INC | | | SCAC3 |
| 25 | ALAA | ALAMO AMBULANCE SERVICE INC | | | SCAC4 |
| 26 | ALAB | Alabama R.R. Co. | added 7/1993; 1/1994-7/2005 | | NAKINA |
| 27 | ALAB | Alabama R.R. Co. | added 7/93; 1/94-7/2000 | | NRHS |
| 28 | ALAB | ALABAMA RAILROAD COMPANY, INC. | | | PWRC |
| 29 | ALAB | Alabama Railroad | | | RSRV |
| 30 | ALAB | ALABAMA RAILROAD CO INC | | | SCAC3 |
| 31 | ALAB | ALABAMA RAILROAD CO INC | | | SCAC4 |
| 32 | ALAB | Alabama Railroad | | USA | TRAFFIC |
| 33 | ALAC | ALASKA TRANSPORT | | | SCAC3 |
| 34 | ALAD | ALADIN VAN LINES, INCORPORATED | | | SCAC3 |
| 35 | ALAD | ALANIS RIVERA, JOSUE DAVID | | | SCAC4 |
| 36 | ALAF | ALABAMA FREIGHT INC | | | SCAC3 |
| 37 | ALAH | ALLAIRE TRANSPORT | | | SCAC3 |
| 38 | ALAI | ALL AMERICAN CARTAGE | | | SCAC3 |
| 39 | ALAJ | ALADDIN INC | | | SCAC3 |
| 40 | ALAK | ALASKA ORIENT VAN SERVICE, INC | | | SCAC3 |
| 41 | ALAL | ATLANTA AIR TRANSPORTATION INC | | | SCAC3 |
| 42 | ALAL | ATLANTA AIR TRANSPORTATION INC | | | SCAC4 |
| 43 | ALAM | ALAMO BUS LINES, INC | | | SCAC3 |
| 44 | ALAM | ALAMPI, ANTHONY P | | | SCAC4 |
| 45 | ALAN | ALAN MOTOR LINES INC | | | SCAC3 |
| 46 | ALAND | ARBOTEC GmbH | | DE | VKM |
| 47 | ALAP | AIR LIQUIDE AMERICA LP | | | SCAC4 |
| 48 | ALAQ | ALL AMERICAN WAREHOUSE | | | SCAC3 |
| 49 | ALAQ | ARROW LINE ACQUISITION LLC | | | SCAC4 |
| 50 | ALAR | ALLARD EXCAVATING | | | SCAC3 |
| 51 | ALAS | ALASKA TERMINALS INC | | | SCAC3 |
| 52 | ALAS | ALASKA TERMINALS INC | | | SCAC4 |
| 53 | ALAT | ATLANTIS EXPRESS INC | | | SCAC3 |
| 54 | ALAT | ALASAN TRUCKING | | | SCAC4 |
| 55 | ALAU | JSC EKOPET | | RUS | BIC |
| 56 | ALAU | ALUMINUM COMPANY OF AMERICA | | | SCAC3 |
| 57 | ALAU | LIMITED LIABILITY COMPANY EKOPET | | | SCAC4 |
| 58 | ALAX | Equistar Chemicals, LP | added 4/1998; 7/2000-7/2005 | | NAKINA |
| 59 | ALAX | Lyondell Petrochemical Co. | added 4/1996; eliminated 4/1998 | | NAKINA |
| 60 | ALAX | Occidental Chemical Corp. | added 1/1992; 1/1994; eliminated 10/1995 | | NAKINA |
| 61 | ALAX | Occidental Chemical Corp., Alathon Polymers Division | added 7/1990; eliminated 1/1992 | | NAKINA |
| 62 | ALAX | Oxy Petrochemicals Inc. | added 1/1990; eliminated 7/1990 | | NAKINA |
| 63 | ALAX | Cain Chemical Inc. | added 4/1988; eliminated 1/1990 | | NAKINA |
| 64 | ALAX | Alabama Metalurgical Corp. | added 7/1974; 1/1975-1/1980; eliminated 1/1982 | | NAKINA |
| 65 | ALAX | Union Oil Co. of California | added 1/1960; 4/1961; eliminated 7/1962 | | NAKINA |
| 66 | ALAX | Alaska Asphalt Co. | added 4/1959; eliminated 7/1959 | | NAKINA |
| 67 | ALAX | Alaska Asphalt Co. | eliminated 7/59 | | NRHS |
| 68 | ALAX | Union Oil Co. of California | added 1/60; 4/61 | | NRHS |
| 69 | ALAX | Alabama Metalurgical Corp. | added 7/74; 1/75-1/80; eliminated 1/82 | | NRHS |
| 70 | ALAX | Cain Chemical Inc. | added 4/88; eliminated 1/90 | | NRHS |
| 71 | ALAX | Oxy Petrochemicals Inc. | added 1/90; eliminated 7/90 | | NRHS |
| 72 | ALAX | Occidental Chemical Corp., Alathon Polymers Division | added 7/90; eliminated 1/92 | | NRHS |
| 73 | ALAX | Occidental Chemical Corp. | added 1/92; 1/94; eliminated 10/95 | | NRHS |
| 74 | ALAX | Lyondell Petrochemical Co. | added 4/96; eliminated 4/98 | | NRHS |
| 75 | ALAX | Equistar Chemicals, LP | added 4/98; 7/2000 | | NRHS |
| 76 | ALAX | *ALASKA ASPHALT CO. | | | PWRC |
| 77 | ALAX | *UNION OIL COMPANY OF CALIFORNIA | | | PWRC |
| 78 | ALAX | *ALABAMA METALLURGICAL CORP. | | | PWRC |
| 79 | ALAX | *CAIN CHEMICAL INC. | | | PWRC |
| 80 | ALAX | +EQUISTAR CHEMICALS [OCCIDENTAL CHEMICAL CORP., ALATHON POLYMERS DIV.; OXY PETROCHEMICALS; LYONDELL PETROCHEMICAL]) | | | PWRC |
| 81 | ALAX | Alaska Asphalt (Equistar Chemicals) | | | RSRV |
| 82 | ALAX | EQUISTAR CHEMICALS LP | | | SCAC4 |
| 83 | ALAY | A L A DELIVERY CORP | | | SCAC3 |
| 84 | ALAY | ALACAR LOGISTICS LLC | | | SCAC4 |
| 85 | ALB | Aero Albatros | Callsign: Albatros, | MEX | AVCODES |
| 86 | ALB | Aero Albatros | | | ICAO1 |
| 87 | ALBA | ACCELLAB INC | | | SCAC4 |
| 88 | ALBA | Alba Volán | | H | TRAFFIC |
| 89 | ALBB | ALBIN, BOB TRUCKING | | | SCAC4 |
| 90 | ALBC | ALBINA FUEL CO | | | SCAC3 |
| 91 | ALBC | ALBINA FUEL CO | | | SCAC4 |
| 92 | ALBD | ALL ABOARD TRANSPORT INC | | | SCAC4 |
| 93 | ALBE | ALBEMARLE EUROPE SPRL | | BE | VKM |
| 94 | ALBF | ALBERT BROS INC | | | SCAC3 |
| 95 | ALBF | ALL CITY TRANSPORT LTD | | | SCAC4 |
| 96 | ALBH | ALBRECHT BROS | | | SCAC3 |
| 97 | ALBH | AL TRANS INC | | | SCAC4 |
| 98 | ALBI | ALBERT MOVING & STORAGE | | | SCAC3 |
| 99 | ALBI | ALBERT MOVING & STORAGE | | | SCAC4 |
| 100 | ALBJ | ALBATRANS INC | | | SCAC4 |
