| 15101 | AUB | Augsburg Airways | IATA: IQ | | ICAO1 |
| 15102 | AUBA | AUTOBAHN FREIGHT LINES LTD | | | SCAC4 |
| 15103 | AUBC | AUTOBUS CARON & LAURIN LTD | | | SCAC3 |
| 15104 | AUBF | AUTOTRANSPORTES HERMANOS DIAZ | | | SCAC4 |
| 15105 | AUBG | AUTOBRIDGE | | | SCAC3 |
| 15106 | AUBH | AUTOBUS COUTURE & CAHILL INC | | | SCAC3 |
| 15107 | AUBI | AUTOBUS INTER-CITY (1986) ENR | | | SCAC3 |
| 15108 | AUBI | AUTO BARN INC, THE | | | SCAC4 |
| 15109 | AUBK | AUBURN TRUCKING CO INC | | | SCAC3 |
| 15110 | AUBL | AUTOBUS L P R INC | | | SCAC3 |
| 15111 | AUBN | AUBURNDALE COMPANY INC | | | SCAC3 |
| 15112 | AUBO | AUDUBON-CESCO CORP | | | SCAC4 |
| 15113 | AUBP | AUTOMOBILE TRANSPORT INC | | | SCAC3 |
| 15114 | AUBR | AUBURN EXPRESS SERVICE | | | SCAC3 |
| 15115 | AUBS | AUTO BUSES DE HUMACAO INC | | | SCAC3 |
| 15116 | AUBT | AUBURN TRANSPORT INC | | | SCAC3 |
| 15117 | AUBX | U.S. Plastic Lumber Ltd. | 7/2005 (not listed) | | NAKINA |
| 15118 | AUBX | US PLASTIC LUMBER LTD. | | | PWRC |
| 15119 | AUBX | US Plastic Lumber | | | RSRV |
| 15120 | AUC | Aero Marine Consulting Pty Ltd. d/b/a Transaustralian Air Express Pty. Ltd. | IATA: HW, Callsign: Auscargo, IATA designator HW* recalled by IATA | AUS | AVCODES |
| 15121 | AUC | A.D.T. (Aviation) Ltd. | Callsign: Auctions, Formerly British Car Auctions (Aviation) Ltd. Merged into Air Hanson during 1990 | GB | AVCODES |
| 15122 | AUC | Austrian Airtransport (Osterreiechische Flugbetriebsgesellschaft mbH.) | IATA: OB, Callsign: Aircharter, ICAO callsign changed to Austrain Aircharter. Charter subsidary of Austrian Airlines | A | AVCODES |
| 15123 | AUC | Austrian Airtransport (Osterreiechische Flugbetriebsgesellschaft mbH.) | IATA: OB, Callsign: Austrian charter, ICAO callsign changed from Aircharter. Charter subsidary of Austrian Airlines | A | AVCODES |
| 15124 | AUC | Aero Marine Consulting Pty Ltd. d/b/a Transaustralian Air Express Pty. Ltd. | Callsign: Auscargo, IATA designator HW* recalled by IATA | AUS | AVCODES |
| 15125 | AUC | Transaustralian Air Express | | | ICAO1 |
| 15126 | AUCA | AUTO CUSTOM CARPETS INC | | | SCAC3 |
| 15127 | AUCA | AURAND TRUCKING INC | | | SCAC4 |
| 15128 | AUCB | AUTOMOBILE CLUB OF MICHIGAN | | | SCAC3 |
| 15129 | AUCC | AUTHORIZED CARRIER CORPORATION | | | SCAC3 |
| 15130 | AUCD | AUTOCON INC | | | SCAC3 |
| 15131 | AUCE | AUTO CARRIERS INC | | | SCAC3 |
| 15132 | AUCE | AULT FARMS | | | SCAC4 |
| 15133 | AUCF | AUTO CARRIER EXPRESS INC | | | SCAC4 |
| 15134 | AUCH | ACCU CHEM CONVERSION INC | | | SCAC4 |
| 15135 | AUCH | Auch Inter-Borough Transit Co | City: Philadelphia | US-PA | TRAFFIC |
| 15136 | AUCJ | AUTOCAR INC | | | SCAC4 |
| 15137 | AUCK | AUSTIN TRUCKING | | | SCAC4 |
| 15138 | AUCK | Auckland Transport | Real: AT, City: Auckland | AUS | TRAFFIC |
| 15139 | AUCL | AUCLAIR TRANSPORTATION INC | | | PWRC |
| 15140 | AUCL | AUCLAIR TRANSPORTATION, INC | | | SCAC3 |
| 15141 | AUCM | AUSTIN CATTLE COMPANY | | | SCAC3 |
| 15142 | AUCN | AUCTION TRANSPORT, INC | | | SCAC3 |
| 15143 | AUCO | AURORA CARTAGE CO | | | SCAC3 |
| 15144 | AUCP | AUSMUS CORPORATION | | | SCAC3 |
| 15145 | AUCP | AUSMUS CORPORATION | | | SCAC4 |
| 15146 | AUCQ | AUTHORITY CHRISTIAN TRANSPORTATION | | | SCAC4 |
| 15147 | AUCR | AUTO CARRIERS INC | | | SCAC3 |
| 15148 | AUCR | AUTOMATED TRANSPORTATION LLC | | | SCAC4 |
| 15149 | AUCS | ACCUCAST | | | SCAC4 |
| 15150 | AUCT | AURORA CARGO TRANSFER CORP | | | SCAC3 |
| 15151 | AUCU | INTA MODAL SL | | | SCAC4 |
| 15152 | AUCV | AUTO CONVOY CO | | | SCAC3 |
| 15153 | AUCV | AUTO EXPRESS ORIENTE SA DE CV | | | SCAC4 |
| 15154 | AUCX | AUTO-TRAIN CORPORATION | | | PWRC |
| 15155 | AUCX | AUTOCOM RAIL SERVICES S DE RL DE DV | | | SCAC4 |
| 15156 | AUCY | AUSTIN CODY EXPRESS | | | SCAC3 |
| 15157 | AUCY | AUTOMATIC COATING LIMITED | | | SCAC4 |
| 15158 | AUD | Audi Air, Inc. | Callsign: Audi Air, | USA | AVCODES |
| 15159 | AUD | TransNorthern Airways, LLC. | Callsign: Genie, | USA | AVCODES |
| 15160 | AUD | Audi Air, Inc. | | | ICAO1 |
| 15161 | AUDC | AUDACIOUS INC | | | SCAC4 |
| 15162 | AUDE | AUXILIAR DE TRANSPORTES MARITIMOS S | | | SCAC3 |
| 15163 | AUDF | AUDUBON FORWARDING INC | | | SCAC3 |
| 15164 | AUDG | AUSTIN DRAYING COMPANY | | | SCAC3 |
| 15165 | AUDI | Audi | | D | TRAFFIC |
| 15166 | AUDM | AUDUBON MOVING & STORAGE INC | | | SCAC3 |
| 15167 | AUDM | AUDUBON MOVING & STORAGE LLC | | | SCAC4 |
| 15168 | AUDN | AUDNEL AMERICA | | | SCAC3 |
| 15169 | AUDN | AUDNEL AMERICA INTERNATIONAL INC. | | | SCAC4 |
| 15170 | AUDO | AUDIO ASSOCIATES | | | SCAC4 |
| 15171 | AUDP | AUTO DEALERS TRANSPORT | | | SCAC3 |
| 15172 | AUDP | AUTOPARTES DE PRECISION DE SANTANA | | | SCAC4 |
| 15173 | AUDS | AUTENS DELIVERY SERVICE INC | | | SCAC3 |
| 15174 | AUDS | ASEO URBANO DE CHIHUAHUA SA DE CV | | | SCAC4 |
| 15175 | AUDV | AUTO DELIVERY | | | SCAC3 |
| 15176 | AUDY | AUDY TRUCKING LLC | | | SCAC4 |
| 15177 | AUE | Universal Aviation Academy | Callsign: Air Universe, | ROK | AVCODES |
| 15178 | AUEA | AUTO EXPRESS ALLENDE SA DE CV | | | SCAC4 |
| 15179 | AUEC | AUTOMATION ELECTRIC AND CONTROL INC | | | SCAC4 |
| 15180 | AUED | ASSURED MOVING & STORAGE | | | SCAC3 |
| 15181 | AUEH | AUTO EXPRESS HERCULES S A DE C V | | | SCAC4 |
| 15182 | AUEL | AMERICAN UNITED EUROPE LINE | | | SCAC3 |
| 15183 | AUEL | AUTOTRANSPORTES EL LAUREL S A DE C | | | SCAC4 |
| 15184 | AUEM | AUTO EXPRESS MEXICANO | | | SCAC3 |
| 15185 | AUEP | ACCURATE TRANSPORTATION INC | | | SCAC4 |
| 15186 | AUER | AUTO EXPRESS ROALSA SA DE CV | | | SCAC4 |
| 15187 | AUEZ | AURORA COOP ELEVATOR | | | PWRC |
| 15188 | AUF | Augusta Air Luftfahrtunternehmen | Callsign: Augusta, | D | AVCODES |
| 15189 | AUF | Augusta Air Luftfahrtunternehmen | | | ICAO1 |
| 15190 | AUFA | ATHENIAN FAITH S A | | | SCAC3 |
| 15191 | AUFF | AURORA FAST FREIGHT, INC | | | SCAC3 |
| 15192 | AUFG | ALBADIA UNITED FOR GENERAL TRADING- | | | SCAC4 |
| 15193 | AUFM | AUSTIN FIREPROOF STORAGE & MOVING C | | | SCAC3 |
| 15194 | AUFO | ALCUS FUEL OIL & SONS INC | | | SCAC4 |
| 15195 | AUFQ | AUTOMATIC FREIGHT INC | | | SCAC3 |
| 15196 | AUFS | AUTOMATED FREIGHT SYSTEMS INC | | | SCAC3 |
| 15197 | AUFS | AFS LOGISTICS INC | | | SCAC4 |
| 15198 | AUG | Cesar Augusto de La Cruz Lepe, C.P.A. | Callsign: Augusto, | MEX | AVCODES |
| 15199 | AUG | Augusta R.R. Co. | 1/1975-1/1980; added 7/1981; eliminated 10/1985; eliminated 10/1986; 1/1994-7/2005 | | NAKINA |
| 15200 | AUG | Augusta R.R. Co. | 1/75-1/80; added 7/81; eliminated 10/86; 1/94-7/2000 | | NRHS |
