| 1 | BAY | Bayon Airlines | Callsign: Bayon, | K | AVCODES |
| 2 | BAY | Bravo Airways | | UA | AVCODES |
| 3 | BAY | Bayon Airlines | | | ICAO1 |
| 4 | BAY | Königlich Bayerische Staatseisenbahnen | | D | TRAFFIC |
| 5 | BAYA | BAY AREA-LOS ANGELES EXPRESS INC | | | SCAC3 |
| 6 | BAYB | BAYLES, ROBERT BAKER | | | SCAC3 |
| 7 | BAYB | BAY BROKERAGE INC | | | SCAC4 |
| 8 | BAYC | BAY CITIES EXPRESS AND TRANSFER CO | | | SCAC3 |
| 9 | BAYE | BAY TRANSPORTATION CORP | | | SCAC3 |
| 10 | BAYE | BAY TRANSPORT INC | | | SCAC4 |
| 11 | BAYER | Bayer Dormagen | | D | TRAFFIC |
| 12 | BAYER | Bayer CropScience Deutschland GmbH | | DE | VKM |
| 13 | BAYF | BAY FORWARDING INC | | | SCAC3 |
| 14 | BAYG | BAY GULF TRADING COMPANY LIMITED | | | SCAC4 |
| 15 | BAYI | BAY-MOR CORP | | | SCAC3 |
| 16 | BAYJ | BAY & BAY TRANSPORTATION SERVICES I | | | SCAC4 |
| 17 | BAYK | BAY CARTAGE CO INC | | | SCAC3 |
| 18 | BAYK | BAY SHIPPERS | | | SCAC4 |
| 19 | BAYL | The Bay Line R.R., L.L.C. | added 4/1994; 7/2000-7/2005 | | NAKINA |
| 20 | BAYL | The Bay Line R.R., L.L.C. | added 4/94; 7/2000 | | NRHS |
| 21 | BAYL | THE BAY LINE RAILROAD, LLC | | | PWRC |
| 22 | BAYL | Bay Line Railroad | | | RSRV |
| 23 | BAYL | BAY LINE RAILROAD L L C, THE | | | SCAC4 |
| 24 | BAYL | Bay Line | | USA | TRAFFIC |
| 25 | BAYM | BAY MOTOR EXPRESS INC | | | SCAC3 |
| 26 | BAYM | BAYMODAL | | | SCAC4 |
| 27 | BAYN | BAY AND BAY TRANSFER CO, INC | | | SCAC3 |
| 28 | BAYO | BAY AREA WAREHOUSE CO | | | SCAC3 |
| 29 | BAYO | BAY AREA WAREHOUSE CO | | | SCAC4 |
| 30 | BAYP | BAYS TRANSCORP INC | | | SCAC3 |
| 31 | BAYP | BAYNOV INC | | | SCAC4 |
| 32 | BAYQ | BAY TRANSPORTATION INC | | | SCAC4 |
| 33 | BAYR | BAY AREA RAPID DELIVERY | | | SCAC3 |
| 34 | BAYS | BAY STATE SMELTING CO INC | | | SCAC3 |
| 35 | BAYT | BAY STATE SHIPPERS | | | SCAC3 |
| 36 | BAYU | CHEMION LOGISTIK GMBH | | D | BIC |
| 37 | BAYU | MOBAY CHEMICAL CORP. | | | PWRC |
| 38 | BAYU | Mobay Chemical Corp (Chemion Logistik) | | | RSRV |
| 39 | BAYU | BAYER-AKTIENGESELLSCHAFT | | | SCAC3 |
| 40 | BAYU | BAYER AG | | | SCAC4 |
| 41 | BAYV | BAYSIDE VANS INC | | | SCAC3 |
| 42 | BAYVIEW | Bayview Bus Lines, NJ | | USA | TRAFFIC |
| 43 | BAYW | BAY WATER TRUCKING CO | | | SCAC4 |
| 44 | BAYX | Union Tank Car Co. | added 7/1983; 1/1994 | | NAKINA |
| 45 | BAYX | Bayer Corp. | added 4/1996; 7/2000-7/2005; eliminated 1/2010 | | NAKINA |
| 46 | BAYX | Bay Chemical Co., Division of Morton Salt Co. | 1/1950-10/1957; eliminated 4/1958 | | NAKINA |
| 47 | BAYX | Morton Chemical Co. | added 4/1958; eliminated 1/1959 | | NAKINA |
| 48 | BAYX | Mobay Chemical Co. | added 7/1974; 1/1975; eliminated 1/1978 | | NAKINA |
| 49 | BAYX | Mobay Chemical Corp. | added 1/1978; 1/1980; eliminated 7/1983 | | NAKINA |
| 50 | BAYX | Bay Chemical Co., Division of Morton Salt Co. | 1/52-10/57 | | NRHS |
| 51 | BAYX | Morton Chemical Co. | eliminated 1/59 | | NRHS |
| 52 | BAYX | Mobay Chemical Co. | added 7/74; 1/75; eliminated 1/78 | | NRHS |
| 53 | BAYX | Mobay Chemical Corp. | added 1/78; 1/80 | | NRHS |
| 54 | BAYX | Union Tank Car Co. | Jan-94 | | NRHS |
| 55 | BAYX | Bayer Corp. | added 4/96; 7/2000 | | NRHS |
| 56 | BAYX | *MOBAY CHEMICAL CORP. [BAY CHEMICAL CO. DIV. MORTON SALT CO.; MORTON CHEMICAL CO.] | | | PWRC |
| 57 | BAYX | +BAYER CORPORATION [(UTCX) UNION TANK CAR CO] | | | PWRC |
| 58 | BAYX | Bayer Corporation | | | RSRV |
| 59 | BAYX | BAYER CORPORATION | | | SCAC4 |
| 60 | BAYY | BAY OIL COMPANY | | | SCAC4 |
| 61 | BAYZ | BAY COUNTY | | | PWRC |
