| 1 | AT | Royal Air Maroc | ICAO: RAM, Callsign: Royalair Maroc, IATA Prefix: 147, | MA | AVCODES |
| 2 | AT | ALASKA TRAIN SHIP CORP. | | | PWRC |
| 3 | AT | Auto Train | | | RSRV |
| 4 | AT | Alpha Trains | | EU | TRAFFIC |
| 5 | AT | Arriva Tog A/S | | DK | VKM |
| 6 | ATA | Air Transport Association of America (ATA) | IATA: XD, Non-airline org. relating to the airline industry | USA | AVCODES |
| 7 | ATA | Aerocondor Transportes Aereos Lda. | IATA: 2B, IATA Prefix: 088, ICAO designator changed to ARD | P | AVCODES |
| 8 | ATA | Universal Air Travel Plan (UATP) | IATA: XD, Non-airline org. relating ti the airline industry | USA | AVCODES |
| 9 | ATA | Air Transport Association | | | ICAO1 |
| 10 | ATA | ATA KARBON MADEN NAKLİYAT DEMİRYOLU TAŞIMACILIĞI VE IŞLETMECİLİĞİ BAKIM ONARIM VE LOJİSTİK HİZMETLERİ GIDA İNŞAAT DIŞ TİCARET LİMİTED ŞİRKETİ | | TR | VKM |
| 11 | ATAA | ATAUDES DE LA FRONTERA SA DE CV | | | SCAC4 |
| 12 | ATAB | AMERICAN TOURS/AMERICAN SPORTSMAN G | | | SCAC3 |
| 13 | ATAB | A-Train AB | | SE | VKM |
| 14 | ATAC | AUTO TRUCK TRANSPORT OF CANADA INC | | | SCAC3 |
| 15 | ATAC | ALPHA TANK CLEANING INC | | | SCAC4 |
| 16 | ATAC | | City: Roma | I | TRAFFIC |
| 17 | ATAD | AUTOTRANSPORTES ADECSA SA DE CV | | | SCAC4 |
| 18 | ATAF | ALLIED TRANSCONTINENTAL FORWARDING | | | SCAC3 |
| 19 | ATAF | Azienda Trasporti dell'Area Fiorentina | City: Firenze | I | TRAFFIC |
| 20 | ATAG | AUSTIN TRANSPORTATION INC | | | SCAC3 |
| 21 | ATAG | ATLANTIC COURIER & CARTAGE LTD | | | SCAC4 |
| 22 | ATAH | AMERICAN TARA CORPORATION | | | SCAC3 |
| 23 | ATAJ | AUTO TRANSPORT AMERICA INC | | | SCAC3 |
| 24 | ATAK | ALLTRANS ALASKA TRUCKLINES INC | | | SCAC3 |
| 25 | ATAL | AUTO TRANSPORTES ALANIS S A DE C V | | | SCAC4 |
| 26 | ATAM | A TRIPLE A MOVING & STORAGE CO | | | SCAC3 |
| 27 | ATAM | ATALMAR LIMITED | | | SCAC4 |
| 28 | ATAN | | City: Napoli | I | TRAFFIC |
| 29 | ATAO | ATC LOGISTICS INC | | | SCAC4 |
| 30 | ATAP | AUTO TRANSPORTE APORTELA | | | SCAC4 |
| 31 | ATAQ | ARCTIC TRAVELER (CANADA) LTD | | | SCAC4 |
| 32 | ATAR | ADAMS TRANSPORTATION LLC | | | SCAC4 |
| 33 | ATAS | ANGELIC TOURS AND SHUTTLES INC | | | SCAC4 |
| 34 | ATAT | ALLEN TRUCK & TRAILER LEASING INC | | | SCAC3 |
| 35 | ATAU | AMATO TRANSPORTS AFFRETEMENT | | F | BIC |
| 36 | ATAU | ATLAS INTERMODAL TRANSPORT CO., LTD | | | SCAC3 |
| 37 | ATAW | ANACONDA TRANSPORTATION & AMWAY TRA | | | SCAC3 |
| 38 | ATAW | ATELIER WELMO S E N C | | | SCAC4 |
| 39 | ATAX | Arizona Transit Assembly | 7/2005 (not listed) | | NAKINA |
| 40 | ATAX | *ALAMEDA CORRIDOR TRANSPORTATION AUTHORITY | | | PWRC |
| 41 | ATAX | +ARIZONA TRANSIT ASSEMBLY | | | PWRC |
| 42 | ATAX | Arizona Transit Assembly (Alameda Corridor Transportation Authority) | | | RSRV |
| 43 | ATAX | ARIZONA TRANSIT ASSEMBLY | | | SCAC4 |
| 44 | ATAY | ATA TRANSPORTATION INC | | | SCAC3 |
| 45 | ATB | Atlantair Ltd. | Callsign: Starlite, | CDN | AVCODES |
| 46 | ATB | Atlantair Ltd. | | | ICAO1 |
| 47 | ATB | ATCHINSON BRIDGE CO. | | | PWRC |
| 48 | ATB | Azienda Trasporti Bergamo | City: Bergamo | I | TRAFFIC |
| 49 | ATBA | AUTO TRANSPORTES BLANCO S A DE C V | | | SCAC4 |
| 50 | ATBC | A & H TRUCK BROKERAGE LLC | | | SCAC4 |
| 51 | ATBD | ACROSS THE BOARD INC | | | SCAC3 |
| 52 | ATBD | ACROSS THE BOARD WOODWORKS | | | SCAC4 |
| 53 | ATBE | A T C EXPRESS INC | | | SCAC3 |
| 54 | ATBE | A T C EXPRESS INC | | | SCAC4 |
| 55 | ATBE | Alpha Trains Belgium NV | | BE | VKM |
| 56 | ATBF | ALVAREZ INC | | | SCAC4 |
| 57 | ATBG | ACTION TRUCK BROKERING INC | | | SCAC3 |
| 58 | ATBG | ATHENS STONECASTING INCORPORATED | | | SCAC4 |
| 59 | ATBH | ALANDIA TANKER COMPANY LTD | | | SCAC3 |
| 60 | ATBI | AUTOBUS TURISMOS RAPIDS INC | | | SCAC3 |
| 61 | ATBI | ANTHONYS TRANSPORT BROKER SERVICES | | | SCAC4 |
| 62 | ATBJ | A T BUS CO INC | | | SCAC3 |
| 63 | ATBK | ASSET TRANSPORTATION INC | | | SCAC3 |
| 64 | ATBK | AIROZA TRANSPORTATION BROKERS | | | SCAC4 |
| 65 | ATBL | ALTOBELL TRUCKING CO | | | SCAC3 |
| 66 | ATBM | ASSOCIATED TRANSPORTATION SERVICE I | | | SCAC3 |
| 67 | ATBM | ASSOCIATED TRANSPORTATION SERVICE I | | | SCAC4 |
| 68 | ATBN | ARLT TRUCKING | | | SCAC3 |
| 69 | ATBP | ADAMS TIMBER PRODUCTS INC | | | SCAC4 |
| 70 | ATBQ | ATHENIAN BEAUTY S A | | | SCAC3 |
| 71 | ATBR | AMERICAN TIMBER FRAME STRUCTURES | | | SCAC3 |
| 72 | ATBS | A TOUCH OF CLASS LIMOUSINE SERVICE | | | SCAC3 |
| 73 | ATBS | A TWO (2) B SYSTEMS INC | | | SCAC4 |
| 74 | ATBT | ATC TRANSPORTATION INC | | | SCAC3 |
| 75 | ATBT | AtB Trondheim | Real: AtB | N | TRAFFIC |
| 76 | ATBU | A-TAINER & SERVICE | | D | BIC |
| 77 | ATBU | A-TAINER & SERVICE | | | SCAC4 |
| 78 | ATBV | ATI | | | SCAC3 |
| 79 | ATBV | ATL TRANSPORT INC | | | SCAC4 |
| 80 | ATBW | AMERICAN TRANSPORTATION INC | | | SCAC3 |
| 81 | ATBW | ALLIANCE PRODUCTION | | | SCAC4 |
| 82 | ATBX | Lithcote Corp. | 4/1970 | | NAKINA |
| 83 | ATBX | Lithcote Corp. | Apr-70 | | NRHS |
| 84 | ATBX | LITHCOTE CORP. | | | PWRC |
| 85 | ATC | Air Tanzania Corporation | IATA: TC, Callsign: Tanzania, IATA Prefix: 197, Name changed to Air Tanzania Company Ltd. ICAO callsign changed from Tango Charlie | EAT | AVCODES |
| 86 | ATC | Air Tanzania Company Limited | IATA: TC, Callsign: Tanzania, IATA Prefix: 197, Name changed from Air Tanzania Corporation. ICAO callsign changed from Tango Charlie | EAT | AVCODES |
| 87 | ATC | Air Tanzania Corporation | IATA: TC, Callsign: Tango Charlie, IATA Prefix: 197, ICAO callsign changed to Tanzania | EAT | AVCODES |
| 88 | ATC | Air Tanzania | IATA: TC | | ICAO1 |
| 89 | ATC | *ASSOCIATIONS TRAILER CAR CO | | | PWRC |
| 90 | ATC | *AUTOTRAIN CORPORATION | | | PWRC |
| 91 | ATC | Angel Trains Cargo | | B | TRAFFIC |
| 92 | ATCA | Astra Trans Carpatic | | RO | TRAFFIC |
| 93 | ATCB | ATCO DISTRIBUTING CO INC | | | SCAC4 |
| 94 | ATCC | ATLANTIC COAST ENVIRONMENTAL INC | | | SCAC3 |
| 95 | ATCE | ATLANTIC CARRIERS INC | | | SCAC3 |
| 96 | ATCE | ATLANTIC CARRIERS INC | | | SCAC4 |
| 97 | ATCF | ARCTIC FORWARDING CO INC | | | SCAC3 |
| 98 | ATCG | ALS TRUCKING CO INC | | | SCAC3 |
| 99 | ATCG | AMS TRUCKING LLC | | | SCAC4 |
| 100 | ATCH | ALVORD TRANSPORT COMPANY LLC | | | SCAC4 |
