| 1 | BYC | Northern Airlines Sanya Limited | Callsign: Beiya, | PRC | AVCODES |
| 2 | BYC | Cambodia Bayon Airlines Limited | IATA: BD, Callsign: Bayon Air, IATA Prefix: 688, Commenced operations during December 2014. Ceased operations in 2019. | K | AVCODES |
| 3 | BYC | Northern Airlines Sanya | | | ICAO1 |
| 4 | BYCB | BAY AREA CAB CO | | | SCAC3 |
| 5 | BYCB | BOOTHBAY CRAFT BREWERY | | | SCAC4 |
| 6 | BYCC | BYCAPE TRUCKING CO | | | SCAC3 |
| 7 | BYCC | BROOKS TRUCKING COMPANY INCORPORATE | | | SCAC4 |
| 8 | BYCG | BERRY TRUCKING | | | SCAC4 |
| 9 | BYCH | BEST YET CHARTER | | | SCAC3 |
| 10 | BYCH | BAILEY, CHRISTOPHER | | | SCAC4 |
| 11 | BYCI | BAY CIRCUIT TRUCKING INC | | | SCAC3 |
| 12 | BYCJ | BYCO | | | SCAC4 |
| 13 | BYCL | BUYERS CONSOLIDATORS LTD | | | SCAC3 |
| 14 | BYCM | BAYCREST MOVING & STORAGE | | | SCAC3 |
| 15 | BYCN | BRYCO INC | | | SCAC3 |
| 16 | BYCO | BYRON CONSTRUCTION CO INC | | | SCAC3 |
| 17 | BYCO | B & Y CREATIONS LTD | | | SCAC4 |
| 18 | BYCR | BAY CARRIERS INC | | | SCAC3 |
| 19 | BYCR | BAYCI TRUCKING INC | | | SCAC4 |
| 20 | BYCS | BEYER, CHARLES | | | SCAC4 |
| 21 | BYCT | BAY CITIES TRANSPORTATION CO | | | SCAC3 |
| 22 | BYCT | BAY CITY EXPRESS INC | | | SCAC4 |
| 23 | BYCX | Chelatchie Prairie R.R. Association d/b/a Battle Ground, Yacolt & Chelatchie Prairie R.R. | 7/2005 (not listed) | | NAKINA |
| 24 | BYCX | BATTLE GROUND, YACOLT & CHELATCHIE PRAIRIE RAILROAD (CHELATCHIE PRAIRIE RAILROAD ASSOCIATION) | | | PWRC |
| 25 | BYCX | Battle Ground Yacolt and Chelatchie Prairie Railroad | | | RSRV |
| 26 | BYCX | BATTLE GROUND YACOLT & CHELATCHIE P | | | SCAC4 |
| 27 | BYCY | BAY CITY TRANSPORTATION INC | | | SCAC4 |
