| 1 | AD | Avialeasing Aviation Company | ICAO: TWN, Callsign: Twinarrow, IATA Prefix: 036, IATA designator changed to EC | UZ | AVCODES |
| 2 | AD | Exec. Express II, Inc. d/b/a Aspen Mountain Air / Lone Star Airlines | ICAO: LSS, Callsign: Lone Star, Filed for bankruptcy in August 1998 and was liquidated in October 1998. | USA | AVCODES |
| 3 | AD | Exec. Express II, Inc. d/b/a Aspen Mountain Air | ICAO: LSS, Filed for bankruptcy in August 1998 and was liquidated in October 1998. | USA | AVCODES |
| 4 | AD | PT. Air Paradise International | ICAO: PRZ, Callsign: Radisair, IATA Prefix: 817, Ceased operations on 24 November 2005. | RI | AVCODES |
| 5 | AD | Antilles Air Boats, Inc. | Callsign: Airboat, | USA | AVCODES |
| 6 | AD | Azul Linhas Aereas Brasileiras | ICAO: AZU, Callsign: Azul, IATA Prefix: 577, | BR | AVCODES |
| 7 | AD | Norfolk, Franklin and Danville Ry. | 4/1970-1/1975; eliminated 1/1975; 1/1980 | | NAKINA |
| 8 | AD | Atlantic and Danville Ry. Co. (Norfolk, Franklin and Danville Ry. Co.) | 10/1966 | | NAKINA |
| 9 | AD | Norfolk, Franklin & Danville Ry. Co. | 7/1965 | | NAKINA |
| 10 | AD | Atlantic and Danville Ry. | 7/1954-4/1961 | | NAKINA |
| 11 | AD | Atlantic and Danville Ry. | 10/57-4/61 | | NRHS |
| 12 | AD | Norfolk, Franklin & Danville Ry. Co. | Jul-65 | | NRHS |
| 13 | AD | Atlantic and Danville Ry. Co. (Norfolk, Franklin and Danville Ry. Co.) | Oct-66 | | NRHS |
| 14 | AD | Norfolk, Franklin and Danville Ry. | 4/70-1/75; eliminated 1/75; 1/80 | | NRHS |
| 15 | AD | NORFOLK, FRANKILN & DANVILLE RWY. [ATLANTIC AND DANVILLE RY.] | | | PWRC |
| 16 | AD | Atlantic and Danville Railway (Norfolk, Franklin and Danville Railway) | | | RSRV |
| 17 | AD | Atlantic and Danville Railway | | USA | TRAFFIC |
| 18 | AD | Freunde des Schienenverkehrs Flensburg e.V | | DE | VKM |
| 19 | ADA | Airservices Australia, Flight Inspection Unit | Callsign: Auscal, | AUS | AVCODES |
| 20 | ADA | Australian Department of Aviation Flying Unit. | | AUS | AVCODES |
| 21 | ADA | Airservices Australia | | | ICAO1 |
| 22 | ADAB | ADA-BOI | | | SCAC3 |
| 23 | ADAC | | | D | TRAFFIC |
| 24 | ADAD | ADEPT ACTION DISPATCH INC | | | SCAC3 |
| 25 | ADAE | ADAM MEYER, INC | | | SCAC3 |
| 26 | ADAF | ADAMS, F G INC | | | SCAC3 |
| 27 | ADAH | ADAMS, HENRY R | | | SCAC3 |
| 28 | ADAI | ADAMIC TRUCKING INC | | | SCAC3 |
| 29 | ADAI | ADEM SANCHEZ, JORGE ANTONIO | | | SCAC4 |
| 30 | ADAJ | ADAMS INC | | | SCAC3 |
| 31 | ADAK | A & D EXPRESS | | | SCAC4 |
| 32 | ADAL | ADRIA CARRIERS LTD | | | SCAC4 |
| 33 | ADAM | ADAMS, ALLEN A | | | SCAC3 |
| 34 | ADAM | ADAMS, ALLEN A | | | SCAC4 |
| 35 | ADAM | Uwe Adam Eisenbahnverkehrsunternehmen GmbH | | D | TRAFFIC |
| 36 | ADAM | Sylvia & Uwe Adam Transport | | DE | VKM |
| 37 | ADAN | ADAMS & SONS TRANSPORTATION INC | | | SCAC4 |
| 38 | ADAO | ADAMO, ALBERT | | | SCAC3 |
| 39 | ADAP | ADAMS, P A MOVING & STORAGE, INC | | | SCAC3 |
| 40 | ADAQ | ANDERSON, ART TRUCKING INC | | | SCAC3 |
| 41 | ADAQ | ANDERSON CRUDE TRANSPORTATION INC | | | SCAC4 |
| 42 | ADAR | ADRIAN CARTAGE AND WAREHOUSING | | | SCAC3 |
| 43 | ADAV | ADAMS VAN LINES | | | SCAC3 |
| 44 | ADAV | ADA VALLEY GOURMET FOODS | | | SCAC4 |
| 45 | ADAW | ADAMS PETROLEUM PRODUCTS INC | | | SCAC4 |
| 46 | ADAY | AMANDAY EXPRESS INC | | | SCAC3 |
| 47 | ADAY | ADVANTAGE EXPRESS INC | | | SCAC4 |
| 48 | ADB | Antonov Design Bureau / Antonov Airlines | Callsign: Antonov Bureau, Changed to registered in Ukraine | RUS | AVCODES |
| 49 | ADB | Antonov Design Bureau / Antonov Airlines | Callsign: Antonov Bureau, Changed from registered in Russian Federation | UA | AVCODES |
| 50 | ADB | Antonov Airlines | | | ICAO1 |
| 51 | ADB | Antonov Airlines | | UA | TRAFFIC |
| 52 | ADBA | ALDEBARAN TANKER CORPORATION | | | SCAC3 |
| 53 | ADBB | A & A DISTRIBUTING CO | | | SCAC3 |
| 54 | ADBB | A C LOGISTICS LTD | | | SCAC4 |
| 55 | ADBC | AMERICAN DISTRIBUTION CENTERS INC | | | SCAC3 |
| 56 | ADBD | ANDRE, BERNARD | | | SCAC3 |
| 57 | ADBE | ADOBE INTERNATIONAL INC | | | SCAC3 |
| 58 | ADBF | Adrian & Blissfield R.R. Co. | added 7/1993; 1/1994-7/2005; eliminated 1/2008 | | NAKINA |
| 59 | ADBF | Adrian & Blissfield Rail Road Co. | added 7/93; 1/94-7/2000 | | NRHS |
| 60 | ADBF | ADRIAN & BLISSFIELD RAILROAD COMPANY | | | PWRC |
| 61 | ADBF | Adrian and Blissfield Railroad | | | RSRV |
| 62 | ADBF | ADRIAN & BLISSFIELD | | | SCAC3 |
| 63 | ADBF | ADRIAN & BLISSFIELD RAIL ROAD COMPA | | | SCAC4 |
| 64 | ADBG | ANDERSON BARGE CO | | | SCAC3 |
| 65 | ADBG | AD BAG INC | | | SCAC4 |
| 66 | ADBH | AMGEN DISTRIBUTION | | | SCAC4 |
| 67 | ADBI | ASSEMBLY & DISTRIBUTION TERMINALS I | | | SCAC3 |
| 68 | ADBK | ADRIAN BUCKHANNON TAXI | | | SCAC3 |
| 69 | ADBL | ARMADORES MARIBELLA S A | | | SCAC3 |
| 70 | ADBL | ARCHIBALD DRILLING & BLASTING (1986 | | | SCAC4 |
| 71 | ADBM | AMERICAN DISTRIBUTION MANAGEMENT IN | | | SCAC3 |
| 72 | ADBN | AUDUBON-BROOKHISER TRANSPORT INC | | | SCAC3 |
| 73 | ADBO | ANDERSON BROTHERS | | | SCAC3 |
| 74 | ADBP | ADAMS, BILL SUPPLY & TRUCKING INC | | | SCAC3 |
| 75 | ADBP | ALDRETE DURAN, JAVIER | | | SCAC4 |
| 76 | ADBQ | ANDERS DISTRIBUTION INC | | | SCAC3 |
| 77 | ADBQ | ADVANTAGE LOGISTICS INC | | | SCAC4 |
| 78 | ADBR | ANDERSON BROTHERS INC | | | SCAC3 |
| 79 | ADBS | ADVANCED DISTRIBUTION SYSTEM INC | | | SCAC3 |
| 80 | ADBT | ADKINS, BILL TRUCKING | | | SCAC3 |
| 81 | ADBU | AGROCEL INDUSTRIES PVT LTD. | | IND | BIC |
| 82 | ADBV | ADMIRAL BUS SERVICE | | | SCAC3 |
| 83 | ADBV | ARTE DE BONEFONT | | | SCAC4 |
| 84 | ADBW | ADB EXPEDITING (LIMITED) ONTARIO | | | SCAC3 |
| 85 | ADBY | ACTION DISTRIBUTION SYSTEMS INC | | | SCAC3 |
| 86 | ADC | Air Atlantic Dominicana | Callsign: Atlan-Dominican, | DOM | AVCODES |
| 87 | ADC | AD Astra Executive Charter SP. Z.o.o | Callsign: AD Astra, | PL | AVCODES |
| 88 | ADC | Air Atlantic Dominicana | | | ICAO1 |
| 89 | ADC | ARCHER DANIEL CORP. | | | PWRC |
| 90 | ADCA | ASSEMBLY AND DISTRIBUTION OF (CA) | | | SCAC3 |
| 91 | ADCA | AUTOTRANSPORTES DE CARGA CALIFORNIA | | | SCAC4 |
| 92 | ADCB | ARGUELLO DELIVERY AND CARGO CORPORA | | | SCAC4 |
| 93 | ADCC | ADKINS CONSTRUCTION CO INC | | | SCAC3 |
| 94 | ADCC | ADKINS CONSTRUCTION CO INC | | | SCAC4 |
| 95 | ADCD | ALLIED CONSOLIDATION SERVICES | | | SCAC3 |
| 96 | ADCD | ALUMITEC DE CD JUAREZ | | | SCAC4 |
| 97 | ADCE | ADCOM EXPRESS INC | | | SCAC3 |
| 98 | ADCF | ADCOR INC | | | SCAC3 |
| 99 | ADCF | AUTOTRANSPORTES DE CARGA FEDERAL GU | | | SCAC4 |
| 100 | ADCG | ADVANCED CARGO TRANSPORT INC | | | SCAC3 |
