| 1 | YB | South African Express Airways (Pty) Ltd. | ICAO: EXY, Callsign: Expressways, Designator YB recalled by IATA. Designator YB reinstated by IATA | ZA | AVCODES |
| 2 | YB | First European Airways | IATA: 5Y, | GR | AVCODES |
| 3 | YB | Harbour Air Ltd. | Designator H3 recalled by IATA | CDN | AVCODES |
| 4 | YB | Bora Jet Havacilik Tasimacilik Ucak | ICAO: BRJ, Callsign: Bora Jet, Commenced operations on 08 May 2010. Suspended operations on 24 April 2017. IATA designator changed from BJ* | TR | AVCODES |
| 5 | YB | The Youngstown Belt R.R. Co. | added 4/1997; 7/2000-7/2005 | | NAKINA |
| 6 | YB | The Youngstown Belt R.R. Co. | added 4/97; 7/2000 | | NRHS |
| 7 | YB | YOUNGSTOWN BELT RAILROAD CO. | | | PWRC |
| 8 | YB | Youngstown Belt Railroad | | | RSRV |
| 9 | YB | YOUNGSTOWN BELT RAILROAD COMPANY, T | | | SCAC4 |
| 10 | YBAR | YBARRA Y CIA SUDAMERICA S A | | | SCAC4 |
| 11 | YBCI | YOL BULK CARRIERS INC | | | SCAC4 |
| 12 | YBE | Stewart Aviation Services, Inc. | Callsign: Yellow Bird, | USA | AVCODES |
| 13 | YBE | Stewart Aviation Services | | | ICAO1 |
| 14 | YBFU | YELLOWBOX FIREWORKS, LLC | | USA | BIC |
| 15 | YBGH | YARBROUGH TRUCKING INC | | | SCAC4 |
| 16 | YBHA | YUBA HEAT | | | PWRC |
| 17 | YBLT | YERBA BUENA LTD | | | SCAC4 |
| 18 | YBRI | YELLOW BRICK ROAD LOGISTICS INC | | | SCAC4 |
| 19 | YBRL | YOUNG BROTHERS LIMITED | | | SCAC4 |
| 20 | YBSI | YELLOW BUS SERVICE INC | | | SCAC4 |
| 21 | YBST | YBS TRUCKING INC | | | SCAC4 |
| 22 | YBTI | YOUNG BROS TRUCKING INCORPORATED | | | SCAC4 |
| 23 | YBTL | YOUNGBLOOD TRUCK LINES INC | | | PWRC |
