| 1 | BLO | Aerotransportes Barlovento, S.A. de C.V. | Callsign: Barlovento, | MEX | AVCODES |
| 2 | BLO | VC Belogorie | Callsign: Belogorie, | RUS | AVCODES |
| 3 | BLOA | BULLOCK OIL CO INC | | | SCAC4 |
| 4 | BLOB | BERNAL, ROBERT GARBALOSA | | | SCAC3 |
| 5 | BLOC | BLOCK & ROSE, INC | | | SCAC3 |
| 6 | BLOCK | Block Busreisen GmbH | | D | TRAFFIC |
| 7 | BLOD | BEST LOGISTICS INC | | | SCAC4 |
| 8 | BLODZV | Buslodz Volan | | PL | TRAFFIC |
| 9 | BLOE | BLOM TRUCKING INC | | | SCAC3 |
| 10 | BLOG | BELL OIL AND GAS COMPANY, THE | | | SCAC3 |
| 11 | BLOH | BALOGH, S L TRUCKING COMPANY | | | SCAC3 |
| 12 | BLOI | BENEDETTI LOGISTICS | | | SCAC4 |
| 13 | BLOK | BASELINE LOGISTICS | | | SCAC4 |
| 14 | BLOL | The Bloomer Line | added 7/1985; eliminated 7/1989; 1/1994-7/2005 | | NAKINA |
| 15 | BLOL | The Bloomer Line | eliminated 7/89; 1/94-7/2000 | | NRHS |
| 16 | BLOL | BLOOMER LINE (BLOOMER SHIPPERS CONNECTING RAILROAD) | | | PWRC |
| 17 | BLOL | Bloomer Line | | | RSRV |
| 18 | BLOL | BLOOMER LINE, THE | | | SCAC3 |
| 19 | BLOL | Bloomer Line | | USA | TRAFFIC |
| 20 | BLON | B-LONG TRANSPORTATION | | | SCAC3 |
| 21 | BLOO | BLOOMS TRANSFER & STG INC | | | SCAC3 |
| 22 | BLOO | BLUEWATER INTERMODAL INC | | | SCAC4 |
| 23 | BLOP | BLOOMFIELD FUEL OIL COMPANY INC | | | SCAC4 |
| 24 | BLOQ | BLOOM TRUCKING INC | | | SCAC3 |
| 25 | BLOQ | BAKER OIL CO | | | SCAC4 |
| 26 | BLOR | BLOOMER LINE | | | PWRC |
| 27 | BLOR | BOLO, ROBERT TRUCKING | | | SCAC3 |
| 28 | BLOS | B L T CORPORATION | | | SCAC3 |
| 29 | BLOV | BELOTTI, VINCENT | | | SCAC3 |
| 30 | BLOV | BELOTTI OIL LTD | | | SCAC4 |
| 31 | BLOW | BELOW TRUCKING LLC | | | SCAC4 |
