| 901 | TB | TUI Airlines Belgium S.A/N.V. t/a Jetairfly | ICAO: JAF, Callsign: Beauty, Name changed to TUI Airlines Belgium NV t/a TUI fly Belgium w.e.f. 19 October 2016. Name changed from TUI Airlines Belgium. ICAO code changed from TUB w.e.f. 31 October 2006. | B | AVCODES |
| 902 | TB | Tara Air Pvt. Ltd | Callsign: Tara Air, | NEP | AVCODES |
| 903 | TB | Air Tara Limited | ICAO: AGP, Callsign: Air Tara, Name changed to GPA Group Plc. Founded on 28 February 1977. | IRL | AVCODES |
| 904 | TB | TUI Airlines Belgium NV t/a TUI fly Belgium | ICAO: JAF, Callsign: Beauty, Name changed from TUI Airlines Belgium t/a Jetairfly w.e.f. 19 October 2016. Name changed from TUI Airlines Belgium. ICAO code changed from TUB w.e.f. 31 October 2006. | B | AVCODES |
| 905 | TB | Twin Branch R.R. Co. | 1/1975; eliminated 7/1978 | | NAKINA |
| 906 | TB | Twin Branch R.R. Co. | 1/75; eliminated 7/78 | | NRHS |
| 907 | TB | TWIN BRANCH RAILROAD CO. | | | PWRC |
| 908 | TB | Trogenerbahn | | CH | TRAFFIC |
| 909 | TBA | Transbrasil S.A. Linhas Aereas | IATA: TR, Callsign: Transbrasil, IATA Prefix: 653, Suspended Operations on 03 December 2001. ICAO callsign changed from Tango Romeo | BR | AVCODES |
| 910 | TBA | Transbrasil S.A. Linhas Aereas | IATA: TR, Callsign: Tango Romeo, Suspended Operations on 03 December 2001. ICAO callsign changed to Transbrasil | BR | AVCODES |
| 911 | TBA | Tibet Airlines Corporation Limited | IATA: TV, Callsign: Tibet, | PRC | AVCODES |
| 912 | TBA | Transbrasil | IATA: TR | | ICAO1 |
| 913 | TBA | Trenes de Buenos Aires | | RA | TRAFFIC |
| 914 | TBAB | TRANSBULK A B | | | SCAC3 |
| 915 | TBAC | TRANSBORDER AIR CARGO INC | | | SCAC4 |
| 916 | TBAG | TBA INC | | | SCAC4 |
| 917 | TBAI | TOBAR INC | | | SCAC3 |
| 918 | TBAJ | TRANSPORTES DEL BAJIO ZAVALA | | | SCAC4 |
| 919 | TBAL | TRANSBALCO S A DE C V | | | SCAC4 |
| 920 | TBAN | TURBAN TRANSPORTATION INC | | | SCAC4 |
| 921 | TBAO | TUBARAO BULK CARRIERS INC NEW YORK | | | SCAC3 |
| 922 | TBAO | T & B TRASNPORTATION INC | | | SCAC4 |
| 923 | TBAP | T B & P EXPRESS INC | | | SCAC3 |
| 924 | TBAR | TRANSPORTES BENJAMIN ARAGON RENDON | | | SCAC4 |
| 925 | TBAS | TB & S CARTAGE | | | SCAC3 |
| 926 | TBAS | TRANSPORTES BARRERA | | | SCAC4 |
| 927 | TBAT | THIBAULT & ASSOCIATES | | | SCAC4 |
| 928 | TBAX | Toronto Pipe Line Co. | 1/1950-10/1957; eliminated 4/1960 | | NAKINA |
| 929 | TBAX | Canadian General Transit Co., Ltd. | added 4/1960; 4/1961 (not listed); eliminated 4/1961 | | NAKINA |
| 930 | TBAX | Toronto Pipe Line Co. | 1/52-10/57 | | NRHS |
| 931 | TBAX | Canadian General Transit Co., Ltd. | 4/61; eliminated 4/61 | | NRHS |
| 932 | TBAX | CANADIAN GENERAL TRANSIT CO., LTD. [TORONTO PIPE LINE CO.] | | | PWRC |
| 933 | TBAY | TRANS-BAY TRUCKING | | | SCAC3 |
| 934 | TBAY | TRANS-BAY TRUCKING | | | SCAC4 |
| 935 | TBB | Air Iberia | Callsign: Iberline, | GE | AVCODES |
| 936 | TBB | TAYLOR & BREWER | | | PWRC |
| 937 | TBB | TROBECS BUS SERVICE INC | | | SCAC4 |
| 938 | TBBB | THREE B TRUCKING CO (3 B TRUCKING C | | | SCAC3 |
| 939 | TBBB | TRANSPORTES RIOS SABINAS SA DE CV | | | SCAC4 |
| 940 | TBBD | T B BULLDOZING INC | | | SCAC4 |
| 941 | TBBK | TEN BERGE BROKERS INC | | | SCAC4 |
| 942 | TBBL | TRIBBLE, CALVIN TRUCKING | | | SCAC3 |
| 943 | TBBL | TRANSPORTES ESTEBAN SA DE CV | | | SCAC4 |
| 944 | TBBN | TRANSPORTES BAM BAN | | | SCAC4 |
| 945 | TBBO | TRANSPORT BESSETTE & BOUDREAU | | | SCAC4 |
| 946 | TBBQ | TRANSPORT BERNARD BOUSQUET INC | | | SCAC4 |
| 947 | TBBS | TIBBS, RICH | | | SCAC3 |
| 948 | TBBS | TRANSPORTES BARBOSA | | | SCAC4 |
| 949 | TBBT | TIBBETT, R E TRUCKING INC | | | SCAC3 |
| 950 | TBBU | CHINA RAILWAY TIELONG CONTAINER LOG CORP LTD | | PRC | BIC |
| 951 | TBBU | CHINA RAILWAY TIELONG CONTAINER LOG | | | SCAC4 |
| 952 | TBBV | TRANSBULK B V | | | SCAC3 |
| 953 | TBBW | TERAS BBC CHARTERING LLC | | | SCAC4 |
| 954 | TBBX | The Beaver Board Cos. | 7/1923 | | NAKINA |
| 955 | TBBX | BEAVER BOARD CO. | | | PWRC |
| 956 | TBC | Transportes ABC, S.A. de C.V. | Callsign: Trans-ABC, | MEX | AVCODES |
| 957 | TBC | Turbine Air Cargo UK Ltd. | Callsign: Blade, | GB | AVCODES |
| 958 | TBC | Tbilisi Airways Ltd. | IATA: TD, Callsign: Tbilisi, | GE | AVCODES |
| 959 | TBC | Turbine Air Cargo UK | | | ICAO1 |
| 960 | TBCA | TRIBECA TRANSPORTATION GROUP INC | | | SCAC3 |
| 961 | TBCA | TRANSPORTES SERVIN DE BAJA CALIFORN | | | SCAC4 |
| 962 | TBCC | TIRE & BATTERY CORP. | | | PWRC |
| 963 | TBCE | TRANSPORT BAIE-COMEAU INC | | | SCAC4 |
| 964 | TBCF | TRIBULLA CUSTOM FARMING | | | SCAC3 |
| 965 | TBCH | TASHA BLUE COACH LTD | | | SCAC3 |
| 966 | TBCI | TOBACCO CONTRACTORS INC | | | SCAC3 |
| 967 | TBCI | TCI LOGISTICS INC | | | SCAC4 |
| 968 | TBCJ | T B C TOURS | | | SCAC3 |
| 969 | TBCJ | THREE B TRUCKING LLC | | | SCAC4 |
| 970 | TBCK | TBC TRUCKING CORP | | | SCAC4 |
| 971 | TBCK | Tokyo Bay City Kotsu | City: Urayasu | J | TRAFFIC |
| 972 | TBCM | TRUALL BUILDING COMPONENTS INC | | | SCAC4 |
| 973 | TBCN | TER A BEE CORPORATION, THE | | | SCAC3 |
| 974 | TBCO | TEBCO TRUCKING | | | SCAC3 |
| 975 | TBCP | TRUE BLUE CORP | | | SCAC3 |
| 976 | TBCP | TRANSPORTES LUBAR | | | SCAC4 |
| 977 | TBCQ | TRINITY BULK CARRIERS AS OSLO NORWA | | | SCAC3 |
| 978 | TBCQ | TRANSPORT B CRAM | | | SCAC4 |
| 979 | TBCR | T B T CHARTER | | | SCAC3 |
| 980 | TBCR | TRIBUNE LLC | | | SCAC4 |
| 981 | TBCS | TRANS-BORDER CUSTOMS SERVICES INC | | | SCAC3 |
| 982 | TBCS | TURBOCRISTAL INC | | | SCAC4 |
| 983 | TBCT | TOWN BUSINESS CENTER | | | SCAC4 |
| 984 | TBCU | (TBCX) BOEING COMPANY | | | PWRC |
| 985 | TBCU | The Boeing Company | | | RSRV |
| 986 | TBCU | THE BOEING COMPANY | | | SCAC3 |
| 987 | TBCU | THE BOEING COMPANY | | | SCAC4 |
| 988 | TBCV | T B C HOLDINGS LTD | | | SCAC4 |
| 989 | TBCW | TRANSGLOBAL CARGO CARE INC | | | SCAC4 |
| 990 | TBCX | The Boeing Co. | added 1/1968; 4/1970-7/2005 | | NAKINA |
| 991 | TBCX | The Boeing Co. | added 1/68; 4/70-7/2000 | | NRHS |
| 992 | TBCX | BOEING COMPANY | | | PWRC |
| 993 | TBCX | The Boeing Company | | | RSRV |
| 994 | TBCX | BOEING COMPANY | | | SCAC4 |
| 995 | TBCY | TRAILER BRIDGE COMPANY INC. | | | SCAC3 |
| 996 | TBD | Thunderbird Tours | Callsign: Orca, | CDN | AVCODES |
| 997 | TBD | Thunderbird Tours | | | ICAO1 |
| 998 | TBDA | TRANSPORTES BE-DA | | | SCAC4 |
| 999 | TBDD | TRANSPORTATION BROKERS DISPATCH INC | | | SCAC4 |
| 1000 | TBDG | TURNBRIDGE SHIPPING CORPORATION | | | SCAC3 |
