| 11901 | AQTQ | ANTIQUES IN TIME | | | SCAC4 |
| 11902 | AQTR | AQUATRAN INC | | | SCAC3 |
| 11903 | AQTS | ACT TRANSPORTATION SERVICES INC | | | SCAC3 |
| 11904 | AQTT | AQUARIUS TRAILER TOWING | | | SCAC3 |
| 11905 | AQTV | ATS LLC OF CROSSVILLE TN | | | SCAC4 |
| 11906 | AQTW | AUTOMATED LOGISTICS & TRANSPORTATIO | | | SCAC4 |
| 11907 | AQTY | ATA FREIGHT LINE LTD | | | SCAC4 |
| 11908 | AQU | AirQuarius Aviation | Callsign: Quarius, Founded in 1997. Ceased operations on 07 February 2012. | ZA | AVCODES |
| 11909 | AQU | Aquair Luftfahrt GmbH & Co. | IATA: JI, Callsign: Aquair, | D | AVCODES |
| 11910 | AQU | AirQuarius Aviation | | | ICAO1 |
| 11911 | AQUA | AQUA GOLF CORPORATION | | | SCAC3 |
| 11912 | AQUA | AQUA GULF CORPORATION | | | SCAC4 |
| 11913 | AQUB | AQUA TREASURES LTD | | | SCAC4 |
| 11914 | AQUC | AQUIS | | | SCAC4 |
| 11915 | AQUE | AQUA-TECH INC | | | SCAC3 |
| 11916 | AQUG | ACCOMPLISH QUILTING INC | | | SCAC4 |
| 11917 | AQUI | AQUILA MARITME MANAGEMENT GMBH & CO | | | SCAC4 |
| 11918 | AQUL | ALS QUALITY OIL COMPANY INC | | | SCAC4 |
| 11919 | AQUM | AQUARIUS MARINE COMPANY | | | SCAC3 |
| 11920 | AQUP | AQUA PENN | | | SCAC3 |
| 11921 | AQUR | AQUATAUR INC | | | SCAC3 |
| 11922 | AQUS | AQUARIUS TOURS INC | | | SCAC3 |
| 11923 | AQUS | AQUASHIP LTD | | | SCAC4 |
| 11924 | AQUT | AQUA TRAIN INC | | | SCAC3 |
| 11925 | AQUU | AQUA EXPORT, INC. | | | SCAC3 |
| 11926 | AQUU | AQUA EXPORT, INC. | | | SCAC4 |
| 11927 | AQUV | A-ALERT COURIER SERVICE | | | SCAC4 |
| 11928 | AQVL | AMERICAS QUALITY VAN LINES INC | | | SCAC4 |
| 11929 | AQVN | AQUAVENTRONICS | | | SCAC4 |
| 11930 | AQVT | ASTRO TRAVEL & TOURS | | | SCAC4 |
| 11931 | AQWW | ACE WORLD WIDE OF NY INC | | | SCAC4 |
| 11932 | AQZ | Aerodyne Charter Company | Callsign: Quanza, | USA | AVCODES |
| 11933 | AQZ | Aerodyne Charter Company | | | ICAO1 |
| 11934 | AR | Aerolineas Argentinas | ICAO: ARG, Callsign: Argentina, IATA Prefix: 044, | RA | AVCODES |
| 11935 | AR | Aberdeen and Rockfish R.R. Co. | 1/1975; added 7/1978; 1/1980-7/2005 | | NAKINA |
| 11936 | AR | Aberdeen and Rockfish R.R. Co. | 1/75; added 7/78; 1/80-7/2000 | | NRHS |
| 11937 | AR | ABERDEEN & ROCKFISH RAILROAD | | | PWRC |
| 11938 | AR | Aberdeen and Rockfish Railroad | | | RSRV |
| 11939 | AR | ABERDEEN AND ROCKFISH RAILROAD COMP | | | SCAC4 |
| 11940 | AR | Arriva Nederland | Real: AN | NL | TRAFFIC |
| 11941 | AR | Anglia Railways Train Services | | UK | VKM |
| 11942 | ARA | Aerobeira, Sociedade de Transportes Aereos Lda | Callsign: Aerobeira, | P | AVCODES |
| 11943 | ARA | Aurora Air Service, Inc. | Callsign: Aurora, | USA | AVCODES |
| 11944 | ARA | Arik Air | IATA: W3, Callsign: Arik Air, IATA Prefix: 725, Operations restarted. Ceased Operations on 20 September 2012. | WAN | AVCODES |
| 11945 | ARA | Arik Air | | | ICAO1 |
| 11946 | ARA | Arcade & Attica R.R. Corp. | 4/1970; eliminated 11/1973; 1/1975-7/2000; eliminated 1/2005; 7/2005 | | NAKINA |
| 11947 | ARA | Arcade & Attica R.R. Corp. | 4/70; eliminated 11/73; 1/75-7/2000 | | NRHS |
| 11948 | ARA | ARCADE & ATTICA RAILROAD CORP | | | PWRC |
| 11949 | ARA | Arcade and Attica Railroad | | | RSRV |
| 11950 | ARA | Arcade & Attica R.R. Corp. | | USA | TRAFFIC |
| 11951 | ARAB | ARAB CARTAGE & EXPRESS | | | SCAC3 |
| 11952 | ARAB | ARAB CARTAGE & EXPRESS | | | SCAC4 |
| 11953 | ARAC | ARCO AUTO CARRIERS, INC | | | SCAC3 |
| 11954 | ARAD | A-R-A TRUCKING INC | | | SCAC3 |
| 11955 | ARAD | ARA SHOES CANADA INC | | | SCAC4 |
| 11956 | ARAD | | City: Arad | RO | TRAFFIC |
| 11957 | ARAE | ARNIO, ARNIE M | | | SCAC3 |
| 11958 | ARAE | ARPA ENTERPRISES INC | | | SCAC4 |
| 11959 | ARAF | AMERPOLE AIR FREIGHT | | | SCAC3 |
| 11960 | ARAF | ARK VALLEY OIL COMPANY LLC | | | SCAC4 |
| 11961 | ARAG | ARAGO TRUCKING | | | SCAC4 |
| 11962 | ARAH | ARMTEC | | | SCAC4 |
| 11963 | ARAIL | Aarsleff Rail A/S | | DK | VKM |
| 11964 | ARAJ | ARA TRANSPORTATION INC | | | SCAC3 |
| 11965 | ARAJ | ARAUJO GARZA, INDALECIO | | | SCAC4 |
| 11966 | ARAK | ARA TRUCKING CORP | | | SCAC3 |
| 11967 | ARAK | ARAKELIAN ENTERPRISES | | | SCAC4 |
| 11968 | ARAL | ARABIAN STEAMSHIP LINES | | | PWRC |
| 11969 | ARAL | A & L TRUCKING | | | SCAC3 |
| 11970 | ARAM | ARABIAN SHIPPERS | | | PWRC |
| 11971 | ARAMIS | Przewóz Osób i Towarów Firma Aramis, Dariusz Armatys | | PL | TRAFFIC |
| 11972 | ARAO | ARA TRANSPORTATION GROUP | | | SCAC3 |
| 11973 | ARAP | ARAPAHOE PIPE LINE COMPANY | | | SCAC3 |
| 11974 | ARAQ | ARRIOLA TRUCKING | | | SCAC3 |
| 11975 | ARAQ | ARMENDARIZ, JOSE TRUCKING | | | SCAC4 |
| 11976 | ARAR | ARCHER AND ARCHER, INC | | | SCAC3 |
| 11977 | ARAT | ARCADIA TRANSPORTATION COMPANY | | | SCAC3 |
| 11978 | ARAT | AUTO TRANSPORTES FRAJARA | | | SCAC4 |
| 11979 | ARAU | ARA F&D | | ROK | BIC |
| 11980 | ARAU | ALEXANDRIA SHIPPING & NAVIGATION CO | | | SCAC3 |
| 11981 | ARAV | ARAMBEL, JOHN TRUCKING INC | | | SCAC4 |
| 11982 | ARAW | ARROW AIR INC | | | SCAC3 |
| 11983 | ARAW | ARNOFF MOVING & STORAGE OF ALBANY I | | | SCAC4 |
| 11984 | ARAY | ARA TRANSPORTATION INC | | | SCAC3 |
| 11985 | ARAY | ARCO LOGISTICS INC | | | SCAC4 |
| 11986 | ARB | Avia Air N.V. | IATA: 3R, Callsign: Aviair, Ceased operations. IATA designator changed from 8R* | ARU | AVCODES |
| 11987 | ARB | Arubair | | ARU | AVCODES |
| 11988 | ARB | AirBahn, Inc. | Callsign: Airbahn, | USA | AVCODES |
| 11989 | ARB | Avia Air N.V. | | | ICAO1 |
| 11990 | ARBA | AMERICAN RED BALL INTERNATIONAL INC | | | SCAC3 |
| 11991 | ARBB | ANGEL RRV BUS LINE INC | | | SCAC3 |
| 11992 | ARBB | ARVI BASSES | | | SCAC4 |
| 11993 | ARBC | AMERICAN RUBBER PRODUCTS CORP | | | SCAC3 |
| 11994 | ARBD | APTI | | | SCAC4 |
| 11995 | ARBE | ARBE TRANSFER CO INC | | | SCAC3 |
| 11996 | ARBED | Aciéries Réunies de Burbach-Eich-Dudelange | | L | TRAFFIC |
| 11997 | ARBF | AIRBORNE FORWARDING CORPORATION | | | SCAC3 |
| 11998 | ARBF | ARIZONA OUTBACK ADVENTURES | | | SCAC4 |
| 11999 | ARBGI | Arbegui s.a. | | ES | VKM |
| 12000 | ARBH | ARNOLD, BERT | | | SCAC3 |
