| 6201 | BKXB | BOOK EXPRESS NETWORK CO | | | SCAC4 |
| 6202 | BKXC | BULK EXPRESS INCORPORATED | | | SCAC3 |
| 6203 | BKXC | BOYKO TRANSPORTATION LLC | | | SCAC4 |
| 6204 | BKXD | BRISK TRANSPORT LTD | | | SCAC4 |
| 6205 | BKXE | BAKERY EXPRESS DIVISION | | | SCAC3 |
| 6206 | BKXI | BERKELEY EXPRESS INC | | | SCAC3 |
| 6207 | BKXL | BALKAN TRANSPORT LLC | | | SCAC4 |
| 6208 | BKXN | BULK EXPRESS INC | | | SCAC3 |
| 6209 | BKXN | BERKELEY TRANSPORTATION | | | SCAC4 |
| 6210 | BKXP | BALKAN EXPRESS INC | | | SCAC4 |
| 6211 | BKXQ | BLACK SEA TRANSPORTATION INC | | | SCAC4 |
| 6212 | BKXR | BROOKSHIRE EXPRESS SERVICES | | | SCAC3 |
| 6213 | BKXS | BLACK RIBBON EXPRESS INC | | | SCAC4 |
| 6214 | BKXV | BARRICK TRANSPORT SERVICE INC | | | SCAC4 |
| 6215 | BKXY | BROCK EXPRESS INC | | | SCAC4 |
| 6216 | BKY | Bluesky Airways | Callsign: Bluesky Airways, | BW | AVCODES |
| 6217 | BKY | BUCKEYE CORPORATE TRANSPORTATION | | | SCAC4 |
| 6218 | BKYB | BIRKY BROS TRUCKING | | | SCAC3 |
| 6219 | BKYC | BUCKEYE CONCRETE CO | | | SCAC3 |
| 6220 | BKYC | BUCKEYE CORPORATE TRANSPORTATION (B | | | SCAC4 |
| 6221 | BKYD | BREAKER TECHNOLOGY LTD | | | SCAC4 |
| 6222 | BKYE | BROOKLYN EXPRESS | | | SCAC3 |
| 6223 | BKYH | BACK YARD, THE | | | SCAC4 |
| 6224 | BKYI | BUCKEYE INTERMODAL LLC | | | SCAC4 |
| 6225 | BKYM | BROOKLYN MOVERS NC | | | SCAC3 |
| 6226 | BKYM | BUCKEYE MARINE | | | SCAC4 |
| 6227 | BKYN | BROSKY TRUCKING | | | SCAC3 |
| 6228 | BKYR | BONCOSKY TRANSPORTATION INC | | | SCAC3 |
| 6229 | BKYR | BONCOSKY TRANSPORTATION INC | | | SCAC4 |
| 6230 | BKYS | BUCKYS T L C TRANSPORT INC | | | SCAC3 |
| 6231 | BKYT | BECKLEY, TOM TRUCKING | | | SCAC3 |
| 6232 | BKZE | BAKRADZE SHIPPING COMPANY LTD | | | SCAC3 |
| 6233 | BL | Pacific Airlines Co. Ltd. | ICAO: PIC, Callsign: Pacific Express, IATA Prefix: 550, Name changed to Jetstar Pacific w.e.f. 23 May 2008. | VN | AVCODES |
| 6234 | BL | Belair Ile de France | ICAO: FBR, Callsign: Eurobelair, Ceased operations during 2000 | F | AVCODES |
| 6235 | BL | Pelandok Airways (Private) Ltd. | Callsign: Pelandok, | MAL | AVCODES |
| 6236 | BL | Jetstar Pacific Airlines Co. Ltd. | ICAO: PIC, Callsign: Pacific Express, IATA Prefix: 550, Name changed to Pacific Airlines Co. Ltd. Name changed from Pacific Airlines Co. Ltd. w.e.f. 23 May 2008. | VN | AVCODES |
| 6237 | BL | Pacific Airlines Co. Ltd. | ICAO: PIC, Callsign: Pacific Express, IATA Prefix: 550, Name changed from Jetstar Pacific Airlines Co. Ltd. and previously from Pacific Airlines Co. Ltd. w.e.f. 23 May 2008. | VN | AVCODES |
| 6238 | BL | BUTTE LIVESTOCK FEEDING CO. | | | PWRC |
| 6239 | BL | BahnLog Bahnlogistik und Service GmbH | | DE | VKM |
| 6240 | BLA | All Charter Limited | Callsign: All Charter, Ceased operations. | GB | AVCODES |
| 6241 | BLA | Blue Air Aviation S.A. | IATA: 0B, Callsign: Blue Air, IATA Prefix: 475, Suspended operations on 06 September 2022. ICAO code changed from BMS and ICAO callsign changed to Blue Messanger w.e.f. 18 February 2020. Name changed from Blue Air - Airline Management Solution S.R.L. w.e.f. 03 August 2018. | RO | AVCODES |
| 6242 | BLA | All Charter Limited | | | ICAO1 |
| 6243 | BLA | The Baltimore and Annapolis R.R. Co. | 1/1975-1/1980; eliminated 10/1991 | | NAKINA |
| 6244 | BLA | The Baltimore and Annapolis R.R. Co. | 1/75-1/80; eliminated 10/91 | | NRHS |
| 6245 | BLA | RETIRED 04-15-93 ATP (0053) [BALTIMORE & ANNAPOLIS RR.] | | | PWRC |
| 6246 | BLA | Baltimore and Annapolis Railroad | | | RSRV |
| 6247 | BLA | BELLAIR CHARTERS | | | SCAC4 |
| 6248 | BLA | The Baltimore and Annapolis R.R. Co. | | USA | TRAFFIC |
| 6249 | BLAB | BLAND TAXI COMPANY | | | SCAC3 |
| 6250 | BLAC | B-LAK LOGISTIC SERVICES INC | | | SCAC4 |
| 6251 | BLAE | BLAIR, EDDIE R | | | SCAC3 |
| 6252 | BLAF | BLASER FARMS | | | SCAC3 |
| 6253 | BLAG | BAL TRANSPORT INC | | | SCAC4 |
| 6254 | BLAG | Blaguss | | A | TRAFFIC |
| 6255 | BLAGSK | Blaguss Slovakia | | SK | TRAFFIC |
| 6256 | BLAH | BLACKMON TRUCKING INC | | | SCAC3 |
| 6257 | BLAI | BLAIR, E M | | | SCAC3 |
| 6258 | BLAJ | BARRIER, L A & SON INC | | | SCAC4 |
| 6259 | BLAL | BLALOCK EQUIPMENT CORPORATION | | | SCAC4 |
| 6260 | BLAM | BAKERSFIELD-L A MOTOR EXPRESS | | | SCAC3 |
| 6261 | BLAN | BLACKWELL OIL COMPANY INC | | | SCAC4 |
| 6262 | BLAND | Bernhard Landers GmbH | | DE | VKM |
| 6263 | BLAO | BLANCK & SONS DELIVERY SERVICE | | | SCAC3 |
| 6264 | BLAP | BLAKLEY TRANSPORTATION INC | | | SCAC3 |
| 6265 | BLAQ | BLACK TRANSFER & STORAGE CO INC | | | SCAC3 |
| 6266 | BLAS | BLASCHKE TRUCKING COMPANY | | | SCAC3 |
| 6267 | BLAS | BLASCHKE TRUCKING COMPANY | | | SCAC4 |
| 6268 | BLAU | AGENCIA CASAS | | | SCAC3 |
| 6269 | BLAV | BLAIRSVILLE TRANSPORT INC | | | SCAC3 |
| 6270 | BLAV | BLACKHAWK TRANSPORT LLC | | | SCAC4 |
| 6271 | BLAW | BARO, LAWRENCE D | | | SCAC3 |
| 6272 | BLAX | RAILCAR INNOVATIONS LLC | | | SCAC4 |
| 6273 | BLAY | BLANEY FARMS INC | | | SCAC3 |
| 6274 | BLB | Atlantic Air Bvi | Callsign: Air BVI, | GB | AVCODES |
| 6275 | BLB | Blue Bird Aviation Co. Ltd. | Callsign: Bluebird Sudan, | SUD | AVCODES |
| 6276 | BLB | Blue Bird Aviation | | | ICAO1 |
| 6277 | BLB | Burgenlandbahn GmbH | Zeitz (Tochter von KEG und DB Regio) | D | privat-bahn.de |
| 6278 | BLB | Berchtesgadener Land Bahn GmbH | Freilassing | D | privat-bahn.de |
| 6279 | BLB | Berchtesgadener Land Bahn | | D | TRAFFIC |
| 6280 | BLB | Burgenlandbahn AG | | DE | VKM |
| 6281 | BLBA | BALBOA TRANSFER AND STORAGE | | | SCAC3 |
| 6282 | BLBA | BLANQUET SANCHEZ, RAFAEL ALBERTO | | | SCAC4 |
| 6283 | BLBB | BLUE RIBBON DELIVERY INC | | | SCAC3 |
| 6284 | BLBC | BILDERBACK, RICHARD E | | | SCAC3 |
| 6285 | BLBD | BLACK BROS & SON DISTRIBUTING INC | | | SCAC3 |
| 6286 | BLBD | BLACK BROS & SON DISTRIBUTING INC | | | SCAC4 |
| 6287 | BLBE | BELBETA SHIPPING COMPANY S A | | | SCAC3 |
| 6288 | BLBE | BLUEBERRY INCORPORATED | | | SCAC4 |
| 6289 | BLBF | BLOOD, BERT R | | | SCAC3 |
| 6290 | BLBF | BELOIN, ERIC ET GEORGES INC | | | SCAC4 |
| 6291 | BLBG | BLASSBERG, J M CORPORATION | | | SCAC3 |
| 6292 | BLBG | BOSMA POULTRY INC | | | SCAC4 |
| 6293 | BLBH | BRECHT LOGISTICS INC | | | SCAC4 |
| 6294 | BLBI | BURNS, L B & SONS INC | | | SCAC3 |
| 6295 | BLBI | BLB TRANSPORT CORP | | | SCAC4 |
| 6296 | BLBK | BELBECK TRUCKING | | | SCAC3 |
| 6297 | BLBL | BLUE BELL POTATO CHIP CO | | | SCAC3 |
| 6298 | BLBL | BLUE LINE SHIP MANAGEMENT SA | | | SCAC4 |
| 6299 | BLBM | BLOOMSBURG MOVING & STORAGE INC | | | SCAC3 |
| 6300 | BLBN | BLACK BALL LINES INC | | | SCAC3 |
