| 1 | BRR | Mountain Air Service, Inc. | Callsign: Mountain Air, | USA | AVCODES |
| 2 | BRR | Mountain Air Service | | | ICAO1 |
| 3 | BRR | Belton R.R. Co. | 1/1975-1/1980; eliminated 10/1991; 1/1994 | | NAKINA |
| 4 | BRR | Belton R.R. Co. | 1/75-1/80; eliminated 10/91; 1/94 | | NRHS |
| 5 | BRR | *BARNEGAT RAILROAD | | | PWRC |
| 6 | BRR | *BOOTHEEL REGIONAL RAIL CORPORATION | | | PWRC |
| 7 | BRR | *RETIRED 06-25-91 ATP (207) [BELTON RAILROAD] | | | PWRC |
| 8 | BRR | Belton Railroad | | | RSRV |
| 9 | BRRA | BROWN REFRIGERATED EXPRESS INC | | | SCAC3 |
| 10 | BRRB | BERRYHILL FARM | | | SCAC4 |
| 11 | BRRC | Borinstein R.R. Co. | 1/1994-7/2005 | | NAKINA |
| 12 | BRRC | Borinstein R.R. Co. | 1/94-7/2000 | | NRHS |
| 13 | BRRC | BORINSTEIN RAILROAD CO. | | | PWRC |
| 14 | BRRC | Borinstein Railroad | | | RSRV |
| 15 | BRRC | BORINSTEIN RAILROAD CO | | | SCAC3 |
| 16 | BRRC | BERRY COVALENCE | | | SCAC4 |
| 17 | BRRD | BEAR TRUCKING CO | | | SCAC3 |
| 18 | BRRE | BARRIEAU MOVING & STORAGE CO | | | SCAC3 |
| 19 | BRRE | BEST RIDER TRANSPORT LTD | | | SCAC4 |
| 20 | BRRH | BRRR HEATING OIL INC | | | SCAC4 |
| 21 | BRRL | B R RELOCATIONS INC | | | SCAC4 |
| 22 | BRRM | BOYER-ROSENE MOVING & STORAGE INC | | | SCAC3 |
| 23 | BRRN | BURNS MOTOR FREIGHT, INC | | | SCAC3 |
| 24 | BRRO | BROWNING, ROBERT P | | | SCAC3 |
| 25 | BRRO | B & R RELIABLE TRANSPORTATION SERVI | | | SCAC4 |
| 26 | BRRP | BROKERS TRANSPORT INC | | | SCAC3 |
| 27 | BRRQ | BERRYMAN TRANSFER AND STORAGE COMPANY, INC | | | SCAC3 |
| 28 | BRRQ | BERRYMAN TRANSFER AND STORAGE COMPA | | | SCAC4 |
| 29 | BRRR | BARE ROCK RAILROAD | | | PWRC |
| 30 | BRRR | BERRIER, ROY E & SONS | | | SCAC4 |
| 31 | BRRS | BROTHERS TRANSPORTATION INC | | | SCAC3 |
| 32 | BRRS | BLAIR TRANSPORT | | | SCAC4 |
| 33 | BRRT | BARRETT HIDES INC | | | SCAC4 |
| 34 | BRRU | BURNS REEFER CONTAINERS | | | SCAC3 |
| 35 | BRRV | BRUNS, R E | | | SCAC3 |
| 36 | BRRV | BARRY LAND DEVELOPMENT OF SW FL INC | | | SCAC4 |
| 37 | BRRW | BROWNS REFRIGERATED WAREHOUSES | | | SCAC3 |
| 38 | BRRW | BARRIE WELDING & MACHINE (1974) LTD | | | SCAC4 |
| 39 | BRRX | Brooklyn Resource Recovery | added 10/1996; eliminated 1/1998; 7/2000-7/2005 (not listed) | | NAKINA |
| 40 | BRRX | Brooklyn Resource Recovery | added 10/96; eliminated 1/98; 7/2000 | | NRHS |
| 41 | BRRX | *BLUE RAPIDS RAILWAY | | | PWRC |
| 42 | BRRX | *BORDEN RESINITE | | | PWRC |
| 43 | BRRX | +BROOKLYN RESOURCE RECOVERY INC. | | | PWRC |
| 44 | BRRX | Brooklyn Resource Recovery | | | RSRV |
| 45 | BRRX | BROOKLYN RESOURCE RECOVERY INC. | | | SCAC4 |
| 46 | BRRY | BARRY TRANSFER & STORAGE CO INC | | | SCAC3 |
| 47 | BRRY | BARRY TRUCKING INC | | | SCAC4 |
