| 11201 | BSXS | BATES EXPRESS | | | SCAC4 |
| 11202 | BSXT | BIG SIX TRANSPORT CO INC | | | SCAC3 |
| 11203 | BSXT | B STAR TRANSPORT LTD | | | SCAC4 |
| 11204 | BSXV | BARRIOS TRANSPORT | | | SCAC4 |
| 11205 | BSXY | BITUMINOUS TRANSPORT | | | SCAC4 |
| 11206 | BSXZ | BS XPRESS INC | | | SCAC4 |
| 11207 | BSY | Big Sky Airlines | IATA: GQ, Callsign: Big Sky, IATA Prefix: 387, Designator GQ recalled by IATA | USA | AVCODES |
| 11208 | BSY | Big Sky Airlines | IATA: GQ | | ICAO1 |
| 11209 | BSYE | BLUE SKYLAND EXPRESS INC | | | SCAC3 |
| 11210 | BSYG | BORGEN SYSTEMS | | | SCAC4 |
| 11211 | BSYL | BLUE SKY LIMO INC | | | SCAC3 |
| 11212 | BSYL | BA-SHI YUEXIN LOGISTICS DEVELOPMENT | | | SCAC4 |
| 11213 | BSYM | BALTIC STAR SHIPPING COMPANY LIMITE | | | SCAC4 |
| 11214 | BSYN | BESTWAY ENTERPRISES INC | | | SCAC3 |
| 11215 | BSYN | BLUE SKY TRUCKING INC | | | SCAC4 |
| 11216 | BSYS | BUILDING SYSTEMS TRANSPORTATION CO | | | SCAC4 |
| 11217 | BSYT | BEASLEY AND SONS TRUCKING INC | | | SCAC4 |
| 11218 | BSYV | BOSHNYAKOVO SHIPPING COMPANY LTD. | | | SCAC3 |
| 11219 | BSZH | BIG STUFF SPECIALIZED HAULING | | | SCAC4 |
| 11220 | BSZK | BSzKRT - Budapest Székesfõvárosi Közlekedési Részvénytársaság | City: Budapest | H | TRAFFIC |
| 11221 | BSZT | B & S TRANSPORTATION INC | | | SCAC3 |
| 11222 | BSZT | BURKHALTER SPECIALIZED TRANSPORT LL | | | SCAC4 |
| 11223 | BT | Air Baltic Corporation S/A | ICAO: BTI, Callsign: Airbaltic, IATA Prefix: 657, | LV | AVCODES |
| 11224 | BT | Air Liberte | ICAO: LIB, Callsign: Air Liberte, IATA designator changed to VD | F | AVCODES |
| 11225 | BT | Airlines of Northern Australia | ICAO: ANT, Callsign: Territory, | AUS | AVCODES |
| 11226 | BT | Rolls Royce Ltd. (Bristol Engine Division) | ICAO: BTU, Callsign: Rolls, Designator BT recalled by IATA | GB | AVCODES |
| 11227 | BT | BIRMINGTON TERMINAL CO. | | | PWRC |
| 11228 | BT | Bodensee-Toggenburg-Bahn | | CH | TRAFFIC |
| 11229 | BT | Bombardier Transportation Sweden AB | | SE | VKM |
| 11230 | BTA | Britt Airways, Inc., d/b/a Continental Express Inc. / Air Mike Express | Callsign: Jet Link, Name changed to Expressjet Airlines, Inc. d/b/a Continental Express | USA | AVCODES |
| 11231 | BTA | Expressjet Airlines, Inc. d/b/a Continental Express | Callsign: Jet Link, IATA Prefix: 565, Name changed from Britt Airways, Inc., d/b/a Continental Express Inc. / Air Mike Express | USA | AVCODES |
| 11232 | BTA | Britt Airlines, Inc. | Callsign: Britt-Air, | USA | AVCODES |
| 11233 | BTA | Belcanto Airlines | Callsign: Belcanto, | BY | AVCODES |
| 11234 | BTA | ExpressJet | IATA: XE | | ICAO1 |
| 11235 | BTAA | BOWSER TRANSPORTATION SYSTEM INC | | | SCAC3 |
| 11236 | BTAA | BLESSED TO BE A BLESSING INC | | | SCAC4 |
| 11237 | BTAB | B & T TRANSPORTATION INC | | | SCAC3 |
| 11238 | BTAB | BROOKS TRANSPORT | | | SCAC4 |
| 11239 | BTAC | BETLEY, A CARTAGE INC | | | SCAC3 |
| 11240 | BTAC | B THREE (B3) COMMUNICATIONS INC | | | SCAC4 |
| 11241 | BTAD | BERTINOIA, DONALD K | | | SCAC3 |
| 11242 | BTAE | BATTEATE, ALBERT A TRUCKING | | | SCAC3 |
| 11243 | BTAE | BUCKSHIRE CORPORATION | | | SCAC4 |
| 11244 | BTAF | BAILEY TRANSFER CO | | | SCAC3 |
| 11245 | BTAG | BEAR TRANSPORTATION SERVICES, INC. | | | SCAC3 |
| 11246 | BTAG | BEAR TRANSPORTATION SERVICES L P | | | SCAC4 |
| 11247 | BTAG | Bantåg - Railcare Group | | S | TRAFFIC |
| 11248 | BTAH | BRIDGER TRANSPORTATION INC | | | SCAC3 |
| 11249 | BTAI | BARRETA TRANSPORTATION INC | | | SCAC3 |
| 11250 | BTAJ | BELL TRANS INC | | | SCAC3 |
| 11251 | BTAK | BUTLER TRANSPORT INC | | | SCAC3 |
| 11252 | BTAK | BUTLER TRANSPORT INC | | | SCAC4 |
| 11253 | BTAL | BARLETTE TRANSPORT LTD | | | SCAC3 |
| 11254 | BTAL | BOULMETIS, TANYA | | | SCAC4 |
| 11255 | BTAM | BATES, GARY | | | SCAC4 |
| 11256 | BTAN | BEST TRANSPORT | | | SCAC3 |
| 11257 | BTAO | BERTRAND OIL COMPANY | | | SCAC3 |
| 11258 | BTAO | BELTRAN BELTRAN, JESUS A | | | SCAC4 |
| 11259 | BTAP | B TWO (2) TRANSPORTATION INC | | | SCAC4 |
| 11260 | BTAQ | BREEDING TRANSFER & STORAGE INC | | | SCAC3 |
| 11261 | BTAR | BETLEY ARMORED COURIER INC | | | SCAC3 |
| 11262 | BTAS | BARNETT TRANSPORTATION INC | | | SCAC3 |
| 11263 | BTAS | BARNETT TRANSPORTATION INC | | | SCAC4 |
| 11264 | BTAT | BUSTERS TRAILER TOTERS | | | SCAC3 |
| 11265 | BTAT | BURNS, TATE | | | SCAC4 |
| 11266 | BTAX | Air Liquide IC GP LLC d/b/a Air Liquide Industrial U.S. LP | added 7/2008 | | NAKINA |
| 11267 | BTAX | Air Liquide America Corp. | added 4/1997; 7/2000-7/2005; eliminated 7/2008 | | NAKINA |
| 11268 | BTAX | Big Three Lincoln-Alaska, Inc. | added 10/1981; 1/1994; eliminated 4/1997 | | NAKINA |
| 11269 | BTAX | Big Three Lincoln-Alaska, Inc. | added 10/81; 1/94; eliminated 4/97 | | NRHS |
| 11270 | BTAX | Air Liquide America Corp. | added 4/97; 7/2000 | | NRHS |
| 11271 | BTAX | *BIG THREE LINCOLN ALASKA, INC. | | | PWRC |
| 11272 | BTAX | +AIR LIQUIDE AMERICA CORP. | | | PWRC |
| 11273 | BTAX | Big Three Lincoln-Alaska (Air Liquide America Corporation) | | | RSRV |
| 11274 | BTAX | BIG THREE LINCOLN ALASKA, INC. | | | SCAC4 |
| 11275 | BTAZ | (BRAX) BRAE CORPORATION | | | PWRC |
| 11276 | BTB | Air National Guard | Callsign: 158 Fighter Wing, | USA | AVCODES |
| 11277 | BTB | Baselland Transport Birsigtalbahn | | CH | TRAFFIC |
| 11278 | BTBA | B & T TRUCKING CO | | | SCAC3 |
| 11279 | BTBA | B & T PALLET INC | | | SCAC4 |
| 11280 | BTBB | BALL TIMBER CO | | | SCAC3 |
| 11281 | BTBC | BADGER TRUCK BROKERAGE COMPANY INC | | | SCAC3 |
| 11282 | BTBE | BAKER TRUCK BROKERAGE INC | | | SCAC3 |
| 11283 | BTBF | BEN TOURS INC | | | SCAC3 |
| 11284 | BTBF | BO TIRE SALES & REMOVAL | | | SCAC4 |
| 11285 | BTBG | BOBS TRUCK BROKERAGE CO | | | SCAC3 |
| 11286 | BTBI | BRITTON TRUCK BROKERAGE INC | | | SCAC3 |
| 11287 | BTBI | BTL LLC | | | SCAC4 |
| 11288 | BTBJ | BUSINESS TRANSPORTATION SOLUTIONS I | | | SCAC4 |
| 11289 | BTBK | BEREA TRUCK BROKERS | | | SCAC3 |
| 11290 | BTBM | BOATNER TRUCKING CO INC | | | SCAC3 |
| 11291 | BTBO | B T B TRUCKING INC | | | SCAC3 |
| 11292 | BTBO | BORDER TO BORDER LOGISTICS LLC | | | SCAC4 |
| 11293 | BTBQ | BOONE TRUCKING SERVICES LLC | | | SCAC4 |
| 11294 | BTBR | BETTENCOURT BROTHERS INC | | | SCAC3 |
| 11295 | BTBR | BITTNER, BRAD | | | SCAC4 |
| 11296 | BTBT | B T B TRUCKING EXPRESS INC | | | SCAC3 |
| 11297 | BTBT | B TWO B (B2B) TRANSPORTATION SERVIC | | | SCAC4 |
| 11298 | BTBU | BOX2BUILD SALES B.V. | | NL | BIC |
| 11299 | BTBU | BASLER TURBO CONVERSIONS | | | SCAC4 |
| 11300 | BTBV | BADGER TRANSPORTATION INC | | | SCAC3 |
