| 11801 | BTS | Aerotaxis Albatros | | | ICAO1 |
| 11802 | BTS | BahnTec GmbH | Trier-Ehrang | D | privat-bahn.de |
| 11803 | BTS | Borehamwood Travel Services | | GB | TRAFFIC |
| 11804 | BTS | BULK TRANSSHIPMENT SLOVAKIA, a.s. | | SK | VKM |
| 11805 | BTSA | BOBS TRANSPORT AND STORAGE COMPANY | | | SCAC3 |
| 11806 | BTSB | BRENHAM TRUCK SERVICE INC | | | SCAC3 |
| 11807 | BTSB | BRITISH TRUCKING INC | | | SCAC4 |
| 11808 | BTSC | BATUSIC, IVAN TRUCK LINES | | | SCAC4 |
| 11809 | BTSC | Bangkok Mass Transit System PCL | | T | TRAFFIC |
| 11810 | BTSD | BENNETT TRANSFER & STORAGE | | | SCAC3 |
| 11811 | BTSD | BAJA TRIMS S DE R L DE C V | | | SCAC4 |
| 11812 | BTSF | BURRUSS TRANSFER INC | | | SCAC3 |
| 11813 | BTSF | BROTHERS TRANSFER SERVICES | | | SCAC4 |
| 11814 | BTSH | BELCHER TRANSFER & STORAGE | | | SCAC3 |
| 11815 | BTSH | BTS | | | SCAC4 |
| 11816 | BTSI | BEST TRANSFER INC | | | SCAC3 |
| 11817 | BTSJ | B T S TRANSPORT SERVICE INC | | | SCAC3 |
| 11818 | BTSJ | BTS LLC | | | SCAC4 |
| 11819 | BTSK | BATES TRUCKING INC | | | SCAC3 |
| 11820 | BTSK | BATES TRUCKING INC | | | SCAC4 |
| 11821 | BTSK | DB Intermodal Services GmgH | | DE | VKM |
| 11822 | BTSL | BETTIS, LARRY | | | SCAC3 |
| 11823 | BTSL | BALANCE TRANSPORTATION SERVICES | | | SCAC4 |
| 11824 | BTSM | BUDS TRUCK SERVICE & TRANSFER | | | SCAC3 |
| 11825 | BTSN | BCT TRANSPORTATION CO INC | | | SCAC3 |
| 11826 | BTSO | BEE LINE TRANSFER & STG | | | SCAC3 |
| 11827 | BTSP | BILALIAN TRANSPORT CORP | | | SCAC3 |
| 11828 | BTSQ | B T S AUTO EXPRESS | | | SCAC3 |
| 11829 | BTSQ | THREE SEVEN SEVEN TWO SEVEN FIVE SI | | | SCAC4 |
| 11830 | BTSS | BARCLAY TRANSPORTATION SERVICES INC | | | SCAC3 |
| 11831 | BTST | BRITISH TRANSPORTATION SERVICES LTD | | | SCAC3 |
| 11832 | BTSU | BTS TANK SOLUTIONS NV | | B | BIC |
| 11833 | BTSU | UNION PACIFIC RAILROAD | | | SCAC3 |
| 11834 | BTSU | CPS LOGISTICS NV | | | SCAC4 |
| 11835 | BTSV | BENDIX TRUCKING SERVICE | | | SCAC3 |
| 11836 | BTSV | BENART TRANSPORTATION SERVICES | | | SCAC4 |
| 11837 | BTSV | Bureau of Transit Services | City: Vancouver BC | CDN | TRAFFIC |
| 11838 | BTSW | BITTERSWEET ENTERPRISES INC | | | SCAC3 |
| 11839 | BTSY | BUTTELL, STANLEY W | | | SCAC3 |
| 11840 | BTT | BT-Slavuta | Callsign: Beetee-Slavuta, | UA | AVCODES |
| 11841 | BTT | Business Jet Travel Airline Ltd | | UA | AVCODES |
| 11842 | BTT | BT-Slavuta | | | ICAO1 |
| 11843 | BTT | BIANCO TRAVEL & TOURS INC | | | SCAC4 |
| 11844 | BTTA | BRITTAIN TRUCKING CO | | | SCAC3 |
| 11845 | BTTB | BASTION TRUCKING | | | SCAC3 |
| 11846 | BTTB | BASTION TRUCKING INC | | | SCAC4 |
| 11847 | BTTC | BEST TRANSPORTATION CORP | | | SCAC3 |
| 11848 | BTTC | BRITTANY TRUCKING CO INC | | | SCAC4 |
| 11849 | BTTD | BETTA TRUCKING CO | | | SCAC3 |
| 11850 | BTTE | BARNES TRANSPORTATION SERVICES INC | | | SCAC4 |
| 11851 | BTTF | BREWTON TRANSFER INC | | | SCAC3 |
| 11852 | BTTF | BATTLEFIELD FARMS INC | | | SCAC4 |
| 11853 | BTTG | BEST TRUCKING SERVICES INC | | | SCAC3 |
| 11854 | BTTG | BERTS TOWING | | | SCAC4 |
| 11855 | BTTH | B. T. TRUCKING, INC | | | SCAC3 |
| 11856 | BTTH | B T TRUCKING INC | | | SCAC4 |
| 11857 | BTTI | BENNETT TRUCK TRANSPORT LLC | | | SCAC4 |
| 11858 | BTTJ | BURLNGTON TOURS INC | | | SCAC3 |
| 11859 | BTTK | BROTT TRUCKING INC | | | SCAC4 |
| 11860 | BTTL | B&T TRUCK LINE, INC | | | SCAC3 |
| 11861 | BTTL | BOURGAULT TILLAGE TOOLS | | | SCAC4 |
| 11862 | BTTM | BRIDGE TERMINAL TRANSPORT | | | SCAC3 |
| 11863 | BTTM | BRIDGE TERMINAL TRANSPORT | | | SCAC4 |
| 11864 | BTTN | BRANT TRANSPORTATION | | | SCAC3 |
| 11865 | BTTQ | B T T INC | | | SCAC3 |
| 11866 | BTTR | BROWN, T TRUCKING | | | SCAC3 |
| 11867 | BTTS | BELL, T TRANSPORT INC | | | SCAC4 |
| 11868 | BTTT | BETTENCOURT, MAURICE | | | SCAC3 |
| 11869 | BTTU | DB CARGO BTT GMBH | | D | BIC |
| 11870 | BTTU | BTT BAHNTANK TRANSPORT GMBH | | | SCAC4 |
| 11871 | BTTV | BROWN, TROY TRUCKING | | | SCAC3 |
| 11872 | BTTW | BULLOCKS TRUCKLAND TOWING | | | SCAC3 |
| 11873 | BTTX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 11874 | BTTX | Trailer Train Co. | added 1/1961; 4/1961-1/1980; eliminated 1/1992 | | NAKINA |
| 11875 | BTTX | Trailer Train Co. (not defined) | added 1/1961; 4/1961 | | NAKINA |
| 11876 | BTTX | Trailer Train Co. (FCS flat cars equipped with bi-level automobile carrying superstructures furnished by member railroads. Cars are not equipped with hitches and bridge plates) | 4/1963 | | NAKINA |
| 11877 | BTTX | Trailer Train Co. (FA flat cars equipped with bi-level automobile carrying superstructures furnished by member railroads. Cars are not equipped with hitches and bridge plates) | 7/1965-10/1968 | | NAKINA |
| 11878 | BTTX | Trailer Train Co. (Flat cars, equipped with bi-level auto racks furnished by participant railroads) | 4/1970-7/1985 | | NAKINA |
| 11879 | BTTX | Trailer Train Co./TTX Co. (not defined) | 10/1991-1/1992 | | NAKINA |
| 11880 | BTTX | TTX Co. (140 ft. intregal articulated bi-level auto rack with end of car cush.) | 7/2000 | | NAKINA |
| 11881 | BTTX | Trailer Train Co. | 4/61-7/65 | | NRHS |
| 11882 | BTTX | Trailer Train Co. (FA flat cars equipped with bi-level automobile carrying superstructures furnished by member railroads. Cars are not equipped with hitches and bridge plates) | 10/66-10/68 | | NRHS |
| 11883 | BTTX | Trailer Train Co. | Apr-70 | | NRHS |
| 11884 | BTTX | Trailer Train Co. (Flat cars, equipped with bi-level auto racks furnished by participant railroads) | 1/75-1/80 | | NRHS |
| 11885 | BTTX | Trailer Train Co. | eliminated 1/92 | | NRHS |
| 11886 | BTTX | TTX Co. | added 1/92 | | NRHS |
| 11887 | BTTX | TTX Co. (140 ft. intregal articulated bi-level auto rack with end of car cush.) | Jul-00 | | NRHS |
| 11888 | BTTX | TTX COMPANY - TRAILER TRAIN CO. | | | PWRC |
| 11889 | BTTX | Trailer Train (TTX Corporation) | | | RSRV |
| 11890 | BTTX | TTX COMPANY | | | SCAC4 |
| 11891 | BTU | Rolls Royce Ltd. (Bristol Engine Division) | Callsign: Rolls, Designator BT recalled by IATA | GB | AVCODES |
| 11892 | BTU | Rolls Royce Ltd. (Bristol Engine Division) | IATA: BT, Callsign: Rolls, Designator BT recalled by IATA | GB | AVCODES |
| 11893 | BTU | Rolls-Royce plc | | | ICAO1 |
| 11894 | BTUA | B & T TRUCKING | | | SCAC3 |
| 11895 | BTUB | BRENNAN TOURS INC | | | SCAC3 |
| 11896 | BTUC | BART TRUCKING CO | | | SCAC3 |
| 11897 | BTUC | BTU ENERGY | | | SCAC4 |
| 11898 | BTUD | BROTHERS TRUCKING CO INC | | | SCAC3 |
| 11899 | BTUE | BARRETT TRUCKING INC | | | SCAC3 |
| 11900 | BTUF | BUNTIN TRUCKING | | | SCAC3 |
