| 1 | 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 |
| 2 | BL | Belair Ile de France | ICAO: FBR, Callsign: Eurobelair, Ceased operations during 2000 | F | AVCODES |
| 3 | BL | Pelandok Airways (Private) Ltd. | Callsign: Pelandok, | MAL | AVCODES |
| 4 | 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 |
| 5 | 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 |
| 6 | BL | BUTTE LIVESTOCK FEEDING CO. | | | PWRC |
| 7 | BL | BahnLog Bahnlogistik und Service GmbH | | DE | VKM |
| 8 | BLA | All Charter Limited | Callsign: All Charter, Ceased operations. | GB | AVCODES |
| 9 | 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 |
| 10 | BLA | All Charter Limited | | | ICAO1 |
| 11 | BLA | The Baltimore and Annapolis R.R. Co. | 1/1975-1/1980; eliminated 10/1991 | | NAKINA |
| 12 | BLA | The Baltimore and Annapolis R.R. Co. | 1/75-1/80; eliminated 10/91 | | NRHS |
| 13 | BLA | RETIRED 04-15-93 ATP (0053) [BALTIMORE & ANNAPOLIS RR.] | | | PWRC |
| 14 | BLA | Baltimore and Annapolis Railroad | | | RSRV |
| 15 | BLA | BELLAIR CHARTERS | | | SCAC4 |
| 16 | BLA | The Baltimore and Annapolis R.R. Co. | | USA | TRAFFIC |
| 17 | BLAB | BLAND TAXI COMPANY | | | SCAC3 |
| 18 | BLAC | B-LAK LOGISTIC SERVICES INC | | | SCAC4 |
| 19 | BLAE | BLAIR, EDDIE R | | | SCAC3 |
| 20 | BLAF | BLASER FARMS | | | SCAC3 |
| 21 | BLAG | BAL TRANSPORT INC | | | SCAC4 |
| 22 | BLAG | Blaguss | | A | TRAFFIC |
| 23 | BLAGSK | Blaguss Slovakia | | SK | TRAFFIC |
| 24 | BLAH | BLACKMON TRUCKING INC | | | SCAC3 |
| 25 | BLAI | BLAIR, E M | | | SCAC3 |
| 26 | BLAJ | BARRIER, L A & SON INC | | | SCAC4 |
| 27 | BLAL | BLALOCK EQUIPMENT CORPORATION | | | SCAC4 |
| 28 | BLAM | BAKERSFIELD-L A MOTOR EXPRESS | | | SCAC3 |
| 29 | BLAN | BLACKWELL OIL COMPANY INC | | | SCAC4 |
| 30 | BLAND | Bernhard Landers GmbH | | DE | VKM |
| 31 | BLAO | BLANCK & SONS DELIVERY SERVICE | | | SCAC3 |
| 32 | BLAP | BLAKLEY TRANSPORTATION INC | | | SCAC3 |
| 33 | BLAQ | BLACK TRANSFER & STORAGE CO INC | | | SCAC3 |
| 34 | BLAS | BLASCHKE TRUCKING COMPANY | | | SCAC3 |
| 35 | BLAS | BLASCHKE TRUCKING COMPANY | | | SCAC4 |
| 36 | BLAU | AGENCIA CASAS | | | SCAC3 |
| 37 | BLAV | BLAIRSVILLE TRANSPORT INC | | | SCAC3 |
| 38 | BLAV | BLACKHAWK TRANSPORT LLC | | | SCAC4 |
| 39 | BLAW | BARO, LAWRENCE D | | | SCAC3 |
| 40 | BLAX | RAILCAR INNOVATIONS LLC | | | SCAC4 |
| 41 | BLAY | BLANEY FARMS INC | | | SCAC3 |
| 42 | BLB | Atlantic Air Bvi | Callsign: Air BVI, | GB | AVCODES |
| 43 | BLB | Blue Bird Aviation Co. Ltd. | Callsign: Bluebird Sudan, | SUD | AVCODES |
| 44 | BLB | Blue Bird Aviation | | | ICAO1 |
| 45 | BLB | Burgenlandbahn GmbH | Zeitz (Tochter von KEG und DB Regio) | D | privat-bahn.de |
| 46 | BLB | Berchtesgadener Land Bahn GmbH | Freilassing | D | privat-bahn.de |
| 47 | BLB | Berchtesgadener Land Bahn | | D | TRAFFIC |
| 48 | BLB | Burgenlandbahn AG | | DE | VKM |
| 49 | BLBA | BALBOA TRANSFER AND STORAGE | | | SCAC3 |
| 50 | BLBA | BLANQUET SANCHEZ, RAFAEL ALBERTO | | | SCAC4 |
| 51 | BLBB | BLUE RIBBON DELIVERY INC | | | SCAC3 |
| 52 | BLBC | BILDERBACK, RICHARD E | | | SCAC3 |
| 53 | BLBD | BLACK BROS & SON DISTRIBUTING INC | | | SCAC3 |
| 54 | BLBD | BLACK BROS & SON DISTRIBUTING INC | | | SCAC4 |
| 55 | BLBE | BELBETA SHIPPING COMPANY S A | | | SCAC3 |
| 56 | BLBE | BLUEBERRY INCORPORATED | | | SCAC4 |
| 57 | BLBF | BLOOD, BERT R | | | SCAC3 |
| 58 | BLBF | BELOIN, ERIC ET GEORGES INC | | | SCAC4 |
| 59 | BLBG | BLASSBERG, J M CORPORATION | | | SCAC3 |
| 60 | BLBG | BOSMA POULTRY INC | | | SCAC4 |
| 61 | BLBH | BRECHT LOGISTICS INC | | | SCAC4 |
| 62 | BLBI | BURNS, L B & SONS INC | | | SCAC3 |
| 63 | BLBI | BLB TRANSPORT CORP | | | SCAC4 |
| 64 | BLBK | BELBECK TRUCKING | | | SCAC3 |
| 65 | BLBL | BLUE BELL POTATO CHIP CO | | | SCAC3 |
| 66 | BLBL | BLUE LINE SHIP MANAGEMENT SA | | | SCAC4 |
| 67 | BLBM | BLOOMSBURG MOVING & STORAGE INC | | | SCAC3 |
| 68 | BLBN | BLACK BALL LINES INC | | | SCAC3 |
| 69 | BLBO | BLUE BOLT TRUCKING INC | | | SCAC3 |
| 70 | BLBP | BLUEBIRD TRANSPORTATION INC | | | SCAC3 |
| 71 | BLBP | BUCKLEY TRANSPORTATION INC | | | SCAC4 |
| 72 | BLBQ | BRUCE TRANSFER CO | | | SCAC3 |
| 73 | BLBQ | BLUE RIBBON DISTRIBUTING INC | | | SCAC4 |
| 74 | BLBR | BLOMBERG BROTHERS | | | SCAC3 |
| 75 | BLBR | BLOMBERG BROS INC | | | SCAC4 |
| 76 | BLBS | BALLARD BROTHERS TRUCKING | | | SCAC3 |
| 77 | BLBS | B & L LOGISTICS LLC | | | SCAC4 |
| 78 | BLBT | BLB TRANSPORT INC | | | SCAC4 |
| 79 | BLBV | BALBOA TRAVEL INCORPORATED | | | SCAC3 |
| 80 | BLBW | BRACH TRUCKING INC | | | SCAC4 |
| 81 | BLBY | BILBREY TOURS INC | | | SCAC4 |
| 82 | BLC | Bellesavia | Callsign: Bellesavia, | BY | AVCODES |
| 83 | BLC | Bellesavia | | | ICAO1 |
| 84 | BLC | Butler County R.R. Co. | 8/1920-7/1923 | | NAKINA |
| 85 | BLC | Butler County R.R. Co. | 23-Jul | | NRHS |
| 86 | BLC | BUTLER COUNTY RAILROAD CO. | | | PWRC |
| 87 | BLC | Belt Railway of Chicago | | USA | TRAFFIC |
| 88 | BLCA | BLACK MOTOR LINE | | | SCAC3 |
| 89 | BLCC | BLASCHAK COAL CO | | | SCAC3 |
| 90 | BLCD | BLANCHARD, A CONTRACTING INC | | | SCAC3 |
| 91 | BLCD | BUGLE LOGISTICS | | | SCAC4 |
| 92 | BLCE | BLACKHAWK ENTERPRISES INC | | | SCAC3 |
| 93 | BLCF | BELL CREEK INC | | | SCAC3 |
| 94 | BLCH | BLANCHARD CASH FUEL | | | SCAC4 |
| 95 | BLCI | BELTMANN CARTAGE | | | SCAC3 |
| 96 | BLCJ | B L TRUCKING INC | | | SCAC3 |
| 97 | BLCK | BLAIR, C K INC | | | SCAC4 |
| 98 | BLCL | BLUE COLLAR LOGISTICS INC | | | SCAC4 |
| 99 | BLCM | BLACKHAWK MOVING & STORAGE INC | | | SCAC3 |
| 100 | BLCM | BLACKHAWK MOVING & STORAGE INC | | | SCAC4 |
