| 1 | YO | Heli Air Monaco | ICAO: MCM, Callsign: Heli Air, IATA Prefix: 747, | MC | AVCODES |
| 2 | YOAW | YOURS TRANSPORT INC | | | SCAC4 |
| 3 | YOCI | YORKSTON OIL CO INC | | | SCAC4 |
| 4 | YOCX | Yale Oil Corp. | 7/1923-7/1935 | | NAKINA |
| 5 | YOCX | Yale Oil Association | 7/1937-1/1943 | | NAKINA |
| 6 | YOCX | Union Tank Car Co. | 1/1945 (not listed) | | NAKINA |
| 7 | YOCX | YALE OIL ASSOCIATION (UUNION TANK CAR CO.) | | | PWRC |
| 8 | YODA | D&D Sexton | | | SCAC2 |
| 9 | YODD | YODER, DENNIS TRANSPORT INC | | | SCAC4 |
| 10 | YODO | YOUNG, DANIEL F INC | | | SCAC4 |
| 11 | YODR | YOUNG OIL INC | | | SCAC4 |
| 12 | YOG | Central Aviation, Inc. | Callsign: Yogan Air, | USA | AVCODES |
| 13 | YOG | Central Aviation | | | ICAO1 |
| 14 | YOGI | YOGIS TRUCKING | | | SCAC4 |
| 15 | YOIK | YORK OIL INC | | | SCAC4 |
| 16 | YOIL | YODER OIL INC | | | SCAC4 |
| 17 | YOIU | TRITON CONTAINER INTERNATIONAL LTD | | BM | BIC |
| 18 | YOIU | Triton Container International | | | RSRV |
| 19 | YOIU | TRITON CONTAINER INTERNATIONAL CORP | | | SCAC4 |
| 20 | YOJC | YOUNG, J C | | | SCAC4 |
| 21 | YOKH | YOUNATHAN, KHANNA (K Y) | | | SCAC4 |
| 22 | YOKO | Yokosuka Naval Air Technical Arsenal | | J | TRAFFIC |
| 23 | YOKOK | Yokokawa Bus | | J | TRAFFIC |
| 24 | YOKX | Yale Oil Association | 4/1938 | | NAKINA |
| 25 | YOKX | Yale Oil Association | Apr-38 | | NRHS |
| 26 | YOKX | YALE OIL ASSOCIATION | | | PWRC |
| 27 | YOLA | MP Trolleybusniy Transport, Yoshkar-Ola | | RUS | TRAFFIC |
| 28 | YOLU | CARU GOLDGIE CONTAINERS CO., LTD. | | HK | BIC |
| 29 | YOMI | YEE ON MANAGEMENT INC | | | SCAC4 |
| 30 | YOMT | YO-MAC TRANSPORT INC | | | SCAC4 |
| 31 | YONC | YONKE CHUY | | | SCAC4 |
| 32 | YONG | YOUNG, DONALD TRANSPORT INC | | | SCAC4 |
| 33 | YONK | Yonkers Transit | | US-NY | TRAFFIC |
| 34 | YORF | YOR FOOD SERVICE INC | | | SCAC4 |
| 35 | YORK | YORK OIL SERVICE INC | | | SCAC4 |
| 36 | YORKT | Yorkshire Tiger | | GB | TRAFFIC |
| 37 | YORO | Yoro Railway | Owned by Kintetsu Corporation | J | TRAFFIC |
| 38 | YOSAR | Yosaria Trains, a.s. | | SK | VKM |
| 39 | YOTC | YORK TRANSPORTATION CO. | | | PWRC |
| 40 | YOTX | Yale Oil Tank Line Co. | 7/1935-1/1943 | | NAKINA |
| 41 | YOTX | Yale Oil Tank Line Co. | Apr-38 | | NRHS |
| 42 | YOTX | YALE OIL TANK LINE CO. | | | PWRC |
| 43 | YOUB | YOUNGBLOOD, J A INC | | | SCAC4 |
| 44 | YOUN | YOUNG TRANSPORT L L C | | | SCAC4 |
| 45 | YOUR | YOURWAY TRANSPORTATION INC | | | SCAC4 |
| 46 | YOUR | Yourbus | | GB | TRAFFIC |
| 47 | YOUU | UNIBROM CORP. | | PRC | BIC |
| 48 | YOWT | YOWELL INTERNATIONAL | | | SCAC4 |
