| 11301 | BTBW | BUMPER TO BUMPER WRECKER SERVICE | | | SCAC3 |
| 11302 | BTBX | B.T. Babbitt, Inc. | 8/1920-7/1923 | | NAKINA |
| 11303 | BTBX | B. T. BABBITT, INC. | | | PWRC |
| 11304 | BTC | Bashkir Airlines (BAL) | Callsign: Bashirian, IATA Prefix: 940, Designator V9 recalled by IATA | RUS | AVCODES |
| 11305 | BTC | Baltic Flight Academy | Name changed to BFA Airlines | LT | AVCODES |
| 11306 | BTC | BFA Airlines | Name changed from Baltic Flight Academy | LT | AVCODES |
| 11307 | BTC | BAL Bashkirian Airlines | IATA: V9 | | ICAO1 |
| 11308 | BTC | Birmingham Terminal | 1/1994-7/2005 | | NAKINA |
| 11309 | BTC | Birmingham Terminal | 1/94-7/2000 | | NRHS |
| 11310 | BTC | *BOSTON TERMINAL CO. | | | PWRC |
| 11311 | BTC | +BIRMINGHAM TERMINAL CO. | | | PWRC |
| 11312 | BTC | Birmingham Terminal | | | RSRV |
| 11313 | BTCA | BOATCAN COMPUTER BOAT SALES LIMITED | | | SCAC4 |
| 11314 | BTCB | BLATT TRUCKING CO | | | SCAC3 |
| 11315 | BTCD | BURR TRANSPORTATION CO INC | | | SCAC3 |
| 11316 | BTCE | BULK TRANSPORT CO OF ESSEXVILLE INC | | | SCAC3 |
| 11317 | BTCE | BTC EXPRESS INC | | | SCAC4 |
| 11318 | BTCG | BEST TRUCKING | | | SCAC3 |
| 11319 | BTCH | BAR TRAN CORPORATION | | | SCAC3 |
| 11320 | BTCH | Bombardier Transportation (Switzerland) SA | | CH | VKM |
| 11321 | BTCI | B T CARTAGE CO | | | SCAC3 |
| 11322 | BTCJ | BUCKEYE TRANSPORT CORP | | | SCAC4 |
| 11323 | BTCK | BARTON TRUCKING INC | | | SCAC3 |
| 11324 | BTCL | BLACK THUNDER TRUCKING INC | | | SCAC4 |
| 11325 | BTCM | BROS TRUCKING CO INC | | | SCAC3 |
| 11326 | BTCN | BAR-TRAN CO | | | SCAC3 |
| 11327 | BTCN | BAR-TRAN CO LLC | | | SCAC4 |
| 11328 | BTCO | Boston Terminal Co. | 1/1975-7/2005 | | NAKINA |
| 11329 | BTCO | Boston Terminal Co. | 1/75-7/2000 | | NRHS |
| 11330 | BTCO | *BREWER & TAYLOR CO. | | | PWRC |
| 11331 | BTCO | +BOSTON TERMINAL CO. | | | PWRC |
| 11332 | BTCO | Boston Terminal | | | RSRV |
| 11333 | BTCO | BRABHAM OIL COMPANY INC | | | SCAC4 |
| 11334 | BTCQ | BRADLEY TRUCKING COMPANY | | | SCAC3 |
| 11335 | BTCR | BELL TRUCK RENTAL | | | SCAC3 |
| 11336 | BTCR | BOLTZO TRANSPORT CORPORATION | | | SCAC4 |
| 11337 | BTCS | BALTIC SHIPPING | | | PWRC |
| 11338 | BTCS | BAREFOOT TOURS & CHARTER SERVICE | | | SCAC3 |
| 11339 | BTCT | BEACH TRANSPORTATION COMPANY | | | SCAC4 |
| 11340 | BTCU | BULKMATIC TRANSPORT CO | | | PWRC |
| 11341 | BTCU | Bulkmatic Transport | | | RSRV |
| 11342 | BTCU | BULKMATIC TRANSPORT CO | | | SCAC3 |
| 11343 | BTCU | BULKMATIC TRANSPORT COMPANY | | | SCAC4 |
| 11344 | BTCV | BLOOM TRUCKING | | | SCAC3 |
| 11345 | BTCV | BYFUGLIEN TRUCKING | | | SCAC4 |
| 11346 | BTCX | Browner Turnout Co. | added 1/2007 | | NAKINA |
| 11347 | BTCX | Everest Railcar Services, Inc. | added 7/2005; 7/2005; eliminated 1/2007 | | NAKINA |
| 11348 | BTCX | Baskerville Transit Corp. | 1/1950 | | NAKINA |
| 11349 | BTCX | *BASKERVILLE TRANSIT CORP. | | | PWRC |
| 11350 | BTCX | +BROWNER TURNOUT CO. [EVEREST RAILCAR SERVICES, INC.] | | | PWRC |
| 11351 | BTCX | BROWNER TURNOUT CO | | | SCAC4 |
| 11352 | BTCY | BELLS TRUCKING COMPANY | | | SCAC3 |
| 11353 | BTCY | BAILEY TRUCKING COMPANY INC | | | SCAC4 |
| 11354 | BTCZ | BULKMATIC TRANSPORT COMPANY | | | PWRC |
| 11355 | BTCZ | Bulkmatic Transport | | | RSRV |
| 11356 | BTCZ | BULKMATIC TRANSPORT COMPANY | | | SCAC4 |
| 11357 | BTDB | BECK, T D TRUCKING LLC | | | SCAC4 |
| 11358 | BTDC | BIG T TRUCKING INCORPORATED | | | SCAC4 |
| 11359 | BTDD | BATTEN, DAVID | | | SCAC3 |
| 11360 | BTDD | BARTHCO INTERNATIONAL INC (OHL INTE | | | SCAC4 |
| 11361 | BTDE | BRATTLE DELIVERIES | | | SCAC3 |
| 11362 | BTDE | BEST DECK | | | SCAC4 |
| 11363 | BTDF | BGB TRUCKING | | | SCAC4 |
| 11364 | BTDH | BALTAZAR TRUCKING | | | SCAC4 |
| 11365 | BTDI | BIG T & D INC | | | SCAC3 |
| 11366 | BTDL | BUCKHAM TRANSPORT LTD | | | SCAC3 |
| 11367 | BTDM | BASIC TRUCKING INC | | | SCAC4 |
| 11368 | BTDN | BRIONES TRANSPORT | | | SCAC4 |
| 11369 | BTDO | BROWN, T D OIL COMPANY OF GADSDEN I | | | SCAC4 |
| 11370 | BTDP | BLUE TIDE SHIPPING | | | SCAC4 |
| 11371 | BTDQ | BUHR'S TRUCKING INC | | | SCAC4 |
| 11372 | BTDR | BUTLER DELIVERY SERVICE | | | SCAC3 |
| 11373 | BTDS | BONDED TRUCKING SERVICE INC | | | SCAC3 |
| 11374 | BTDT | BURKS, TODD TRUCKING INC | | | SCAC3 |
| 11375 | BTDV | BURTON DELIVERY SERVICE | | | SCAC3 |
| 11376 | BTDV | BURTON DELIVERY SERVICE LTD | | | SCAC4 |
| 11377 | BTDW | BOYETTE LOGISTICS | | | SCAC4 |
| 11378 | BTE | Air Baltic Eastern | Callsign: Baltic East, | LV | AVCODES |
| 11379 | BTE | Bremen-Thedinghauser Eisenbahn AG | Bremen | D | privat-bahn.de |
| 11380 | BTE | BahnTouristikExpress GmbH | Nürnberg | D | privat-bahn.de |
| 11381 | BTE | BahnTouristikExpress | | D | TRAFFIC |
| 11382 | BTE | Bremen-Thedinghausener Eisenbahn GmbH | | DE | VKM |
| 11383 | BTEA | BIG T & D INC | | | SCAC4 |
| 11384 | BTEB | RE BARNETT AND SONS | | | SCAC3 |
| 11385 | BTEC | BETTER COIL & TRANSFORMER CORP | | | SCAC3 |
| 11386 | BTEC | BRETECH ENGINEERING LTD | | | SCAC4 |
| 11387 | BTED | BENT TREE TRANSPORT INC | | | SCAC4 |
| 11388 | BTEF | B T EXPRESS TRUCKING CO | | | SCAC3 |
| 11389 | BTEF | BLACK TIE TRANSPORTATION & LOGISTIC | | | SCAC4 |
| 11390 | BTEG | B T E TRANSPORT GROUP LTD | | | SCAC4 |
| 11391 | BTEH | BLACK TIGER ENTERPRISES | | | SCAC3 |
| 11392 | BTEH | BLUE THUNDER CARTAGE INC | | | SCAC4 |
| 11393 | BTEI | BT EXPRESS INC | | | SCAC3 |
| 11394 | BTEK | BARTEL TRUCKING | | | SCAC3 |
| 11395 | BTEL | BARTELS, ELDRED | | | SCAC3 |
| 11396 | BTEL | BLACK TOP EXPRESS | | | SCAC4 |
| 11397 | BTEM | BATEMAN TRUCKING | | | SCAC3 |
| 11398 | BTEN | BARNETTS TRUCKING | | | SCAC4 |
| 11399 | BTEO | BRISTOL ERECTORS | | | SCAC3 |
| 11400 | BTEP | B/T EXPRESS | | | SCAC3 |
