| 1 | BA | British Airways P.L.C. | ICAO: BAW, Callsign: Speedbird, IATA Prefix: 125, Formed by the merger of B.E.A and B.O.A.C. | GB | AVCODES |
| 2 | BA | British Overseas Airways Corporation (BOAC) | Callsign: Speedbird, Merged with B.E.A to form British Airways BA/BAW | GB | AVCODES |
| 3 | BA | Consolidated Rail Corp. | added 4/1976; 1/1980-1/1994; eliminated 7/1999 | | NAKINA |
| 4 | BA | Penn Central Transportation Co., Robert W. Blanchette, Richard C. Bond and John H. McArthur, Trustees | eliminated 4/1976 | | NAKINA |
| 5 | BA | Penn Central Transportation Co. | 1/1975 | | NAKINA |
| 6 | BA | Penn Central Transportation Co. | Jan-75 | | NRHS |
| 7 | BA | Penn Central Transportation Co., Robert W. Blanchette, Richard C. Bond and John H. McArthur, Trustees | eliminated 4/76 | | NRHS |
| 8 | BA | Consolidated Rail Corp. | added 4/76; 1/80-1/94; eliminated 7/99 | | NRHS |
| 9 | BA | CONSOLIDATED RAIL CORP. [BOSTON & ALBANY RR; PENN CENTRAL] | | | PWRC |
| 10 | BA | Boston and Albany Railroad (Conrail) | | | RSRV |
| 11 | BA | British Airways | Real: BAW | GB | TRAFFIC |
| 12 | BA&P | Butte, Anaconda & Pacific Ry. | 8/1920-7/1936 | | NAKINA |
| 13 | BA&P | Butte, Anaconda & Pacific Ry. | 23-Jul | | NRHS |
| 14 | BA&P | BUTTE, ANACONDA & PACIFIC RY. | | | PWRC |
| 15 | BAA | Balkan Agro Aviation | Callsign: Balkan Agro, | BG | AVCODES |
| 16 | BAA | Bo-S-Aire Airlines, Inc. | Callsign: Bowman Air, | USA | AVCODES |
| 17 | BAA | Balkan Agro Aviation | | | ICAO1 |
| 18 | BAAA | BUTLER, ARTHUR R | | | SCAC3 |
| 19 | BAAA | BAYMEADOWS MOVING AND STORAGE INC | | | SCAC4 |
| 20 | BAAB | B & A CHARTER TOURS INC | | | SCAC3 |
| 21 | BAAC | BARRON EXPRESS | | | SCAC4 |
| 22 | BAAE | BUDGET AUTO & EQUIPMENT SALES INC | | | SCAC3 |
| 23 | BAAF | BRODERICK AUTO & TRUCK | | | SCAC4 |
| 24 | BAAG | BALLENSKY, ALAN G | | | SCAC3 |
| 25 | BAAH | BRUCE A BOND PETROLEUM LTD | | | SCAC4 |
| 26 | BAAK | BANTA TRUCKING | | | SCAC3 |
| 27 | BAAL | BAR-LYNN STABLES | | | SCAC4 |
| 28 | BAAM | BENSTEAD, A & A TRUCKING LLC | | | SCAC4 |
| 29 | BAAN | BAUR FREIGHT SYSTEMS LLC | | | SCAC4 |
| 30 | BAAO | BROWN & ASSOCIATES INC | | | SCAC3 |
| 31 | BAAP | BARNDT, A PAUL | | | SCAC3 |
| 32 | BAAP | BAR RB LTD | | | SCAC4 |
| 33 | BAAQ | BARABOO ASPHALT COMPANY INC | | | SCAC3 |
| 34 | BAAQ | BREAK AWAY TRUCKING INC | | | SCAC4 |
| 35 | BAAS | BARAKAT ASSOCIATES LTD | | | SCAC3 |
| 36 | BAAS | BAR T5 AGRA SERVICES INC | | | SCAC4 |
| 37 | BAAU | BALTATLANTIC LINE | | | SCAC3 |
| 38 | BAAV | BAER, A VAN AND STORAGE INC | | | SCAC3 |
| 39 | BAAY | BASS, ANTHONY C | | | SCAC4 |
| 40 | BAB | Bahrain Air B.S.C. (Closed) | IATA: 2B, Callsign: Awal, IATA Prefix: 937, IATA desigantor changed to BN | BRN | AVCODES |
| 41 | BAB | Baltic Aviation | IATA: VB, Callsign: Baltic, | S | AVCODES |
| 42 | BAB | Bahrain Air B.S.C. (Closed) | IATA: BN, Callsign: Awal, IATA Prefix: 937, Ceased operations 12 February 2013. IATA desigantor changed from 2B | BRN | AVCODES |
| 43 | BAB | Bahrain Air BSC (Closed) | | | ICAO1 |
| 44 | BABB | BASTANZIO, T INC | | | SCAC4 |
| 45 | BABC | BABCOCK, EARL S | | | SCAC3 |
| 46 | BABD | BALCH, BOB TRUCKING COMPANY | | | SCAC3 |
| 47 | BABE | BAILEY, ALBERT R | | | SCAC3 |
| 48 | BABF | B & B EXPRESS INC | | | SCAC3 |
| 49 | BABF | BAR K RANCHES | | | SCAC4 |
| 50 | BABH | B & B RIGGING & HAULING INC | | | SCAC3 |
| 51 | BABI | BABB TRUCKING CORP | | | SCAC3 |
| 52 | BABJ | B & B MOBILE HOME SALES INC | | | SCAC3 |
| 53 | BABJ | BARBA TIJERINA, MARTIN | | | SCAC4 |
| 54 | BABK | BASBCO TRUCKING INC | | | SCAC3 |
| 55 | BABM | B& B LINES, INC | | | SCAC3 |
| 56 | BABM | B & B LINES INC | | | SCAC4 |
| 57 | BABN | BABSON BROS TRUCKING CO | | | SCAC3 |
| 58 | BABO | BATTY BROS TRANSFER INC | | | SCAC3 |
| 59 | BABP | B & B TRANSPORTATION LIMOUSINE SERV | | | SCAC3 |
| 60 | BABQ | BAUER TRUCKING CO INC | | | SCAC3 |
| 61 | BABR | BARBOURSVILLE TRANSFER, INC | | | SCAC3 |
| 62 | BABS | BAB TRANSFER, INC | | | SCAC3 |
| 63 | BABS | BOARD AND BEAM | | | SCAC4 |
| 64 | BABU | BOYER ALASKA BARGE LINE, INC. | | | SCAC3 |
| 65 | BABU | BOYER LOGISTICS INC | | | SCAC4 |
| 66 | BABV | B & B TRANSFER & STORAGE CO | | | SCAC3 |
| 67 | BABV | BAKER TRUCKING INC | | | SCAC4 |
| 68 | BABW | B AND B SOUTHERN RUST FREE CLASSICS | | | SCAC4 |
| 69 | BABY | Babylon Transit | | USA | TRAFFIC |
| 70 | BAC | BAC Leasing Limited | Ceased operations. | GB | AVCODES |
| 71 | BAC | Buffalo Aeronautical Corp. | Callsign: Buffalo Aero, | USA | AVCODES |
| 72 | BAC | East Aero Service, LLC | | RUS | AVCODES |
| 73 | BAC | BAC Leasing Limited | | | ICAO1 |
| 74 | BACA | BACA & SONS TRUCKING | | | SCAC3 |
| 75 | BACA | R-TRUCKING INC | | | SCAC4 |
| 76 | BACB | BAL-CRAFT | | | SCAC3 |
| 77 | BACC | BAY AREA CONTAINER INC | | | SCAC3 |
| 78 | BACC | BAY AREA CONTAINER INC | | | SCAC4 |
| 79 | BACD | BAUER, CAROL I | | | SCAC3 |
| 80 | BACE | B-A CARTAGE CO INC | | | SCAC3 |
| 81 | BACF | BACA, FRANK | | | SCAC3 |
| 82 | BACH | BACHMAN TRANSFER AND STORAGE, INCOR | | | SCAC3 |
| 83 | BACH | BACHMAN TRANSFER AND STORAGE INCORP | | | SCAC4 |
| 84 | BACH | Verkehrsbetriebe Bachstein | | D | TRAFFIC |
| 85 | BACI | BARNES CORDOVA ELEY | | | SCAC3 |
| 86 | BACI | BRINGER AIR CARGO LTD | | | SCAC4 |
| 87 | BACK | BACKHAUS GARAGE INC | | | SCAC3 |
| 88 | BACK | BACK TWO (2) BACK ENTERPRISE LLC | | | SCAC4 |
| 89 | BACN | BAILEY COKE TRANSPORT INC | | | SCAC3 |
| 90 | BACO | B J CONTRACT CARRIERS INC | | | SCAC3 |
| 91 | BACP | BARRETT ASPHALT CORP | | | SCAC4 |
| 92 | BACQ | B&C TRUCKING COMPANY, INC | | | SCAC3 |
| 93 | BACQ | B & C TRUCKING COMPANY INC | | | SCAC4 |
| 94 | BACR | B & C CARTAGE COMPANY INC | | | SCAC3 |
| 95 | BACS | BARRON, C & SONS INC | | | SCAC4 |
| 96 | BACS | Bács Volán | | H | TRAFFIC |
| 97 | BACU | P.P.U.H BASSAU | | PL | BIC |
| 98 | BACU | BACARDI INTERNATIONAL LTD | | | SCAC3 |
| 99 | BACV | BANBURY, C V | | | SCAC3 |
| 100 | BACV | BAY TRANSPORT INC | | | SCAC4 |
