| 1 | YA | Yeti Airlines (P) Ltd. | | NEP | AVCODES |
| 2 | YAAF | YAAHOO TRANSPORT LOGISTICS LINK | | | SCAC4 |
| 3 | YABM | YATES, DON TRUCKING INC | | | SCAC4 |
| 4 | YAEG | YAEGER TRANSPORT INC | | | SCAC4 |
| 5 | YAEL | YAEL TRUCKING | | | SCAC4 |
| 6 | YAFM | Yemeni Armed Forces | | YE | TRAFFIC |
| 7 | YAGE | Y II AGENCY INC | | | SCAC4 |
| 8 | YAGG | YAGGY, STEVE SPECIALIZED TRUCK SERV | | | SCAC4 |
| 9 | YAGR | YAGER BROS INC | | | SCAC4 |
| 10 | YAK | Yak Design Bureau | Callsign: Yak Avia, | RUS | AVCODES |
| 11 | YAK | Yakolev | | | ICAO1 |
| 12 | YAK | Yakovlev | | SU | TRAFFIC |
| 13 | YAKM | YAKIMA OIL CO INC | | | SCAC4 |
| 14 | YAKU | YAKUTSK CONTAINER AGENCY LLC | | RUS | BIC |
| 15 | YAMA | Yamanashi Kotsu Co. | | J | TRAFFIC |
| 16 | YAMAS | Yamasaki Kanko | | J | TRAFFIC |
| 17 | YAMI | YOUNG, ALLEN MOVERS INC | | | SCAC4 |
| 18 | YAMK | YAMKO TRUCK LINES, INC. | | | SCAC1 |
| 19 | YAMK | YAMKO TRUCK LINES | | | SCAC4 |
| 20 | YAML | YANKEE LINES INC | | | PWRC |
| 21 | YAMO | YAM CITY OIL CO INC | | | SCAC4 |
| 22 | YAMU | YAMATO CUSTOMS BROKERS | | | SCAC4 |
| 23 | YAN | Yancey R.R. Co. | 1/1975; added 1/1980; 1/1980; eliminated 10/1989 | | NAKINA |
| 24 | YAN | Yancey R.R. Co. | 1/75; added 1/80; 1/80; eliminated 10/89 | | NRHS |
| 25 | YAN | YANCY RAILROAD | | | PWRC |
| 26 | YAN | Yancey Railroad | | | RSRV |
| 27 | YAND | YANDELL TRUCKAWAY INC | | | SCAC4 |
| 28 | YANG | YANG LINE | | | SCAC4 |
| 29 | YANK | YANKEE PRIDE TRANSPORT INC | | | SCAC4 |
| 30 | YANKEE | Yankee Trails | | USA | TRAFFIC |
| 31 | YANT | YAN TRANSPORT LOGISTIC | | | SCAC4 |
| 32 | YAP | Yes Airways SP z.o.o. | Callsign: Whitekeko, Name changed to OLT Express Polski | PL | AVCODES |
| 33 | YAPAK | | City: Yakutsk | RUS | TRAFFIC |
| 34 | YARA | Yara Rostock Zweigniederlassung der Yara GmbH & Co. KG | | DE | VKM |
| 35 | YARAF | Yemen Arab Republic Air Force | | YE | TRAFFIC |
| 36 | YARAF | Yara Suomi Oy | | FI | VKM |
| 37 | YARB | YARBROUGH TRANSFER COMPANY | | | SCAC1 |
| 38 | YARB | YARBROUGH TRANSFER COMPANY | | | SCAC4 |
| 39 | YARE | YARZA RODRIGUEZ, MARIA EUGENIA | | | SCAC4 |
| 40 | YARL | YARMOUTH LUMBER INC | | | SCAC4 |
| 41 | YARR | Youngstown & Austintown R.R., Inc. | added 4/1985 | | NAKINA |
| 42 | YARR | Ohio R.R. System | eliminated 10/1992 | | NAKINA |
| 43 | YARR | Columbus & Ohio River R.R. Co., Inc. | added 10/1992 | | NAKINA |
| 44 | YARR | Youngstown & Austintown R.R., Inc. | 1/1994-7/2005 | | NAKINA |
| 45 | YARR | Youngstown & Austintown R.R., Inc. | added 4/85 | | NRHS |
| 46 | YARR | Ohio R.R. System | eliminated 10/92 | | NRHS |
| 47 | YARR | Columbus & Ohio River R.R. Co., Inc. | added 10/92 | | NRHS |
| 48 | YARR | Youngstown & Austintown R.R., Inc. | 1/94-7/2000 | | NRHS |
| 49 | YARR | YOUNGSTOWN & AUSTINTOWN RAILROAD, INC. | | | PWRC |
| 50 | YARR | Youngstown and Austintown Railroad | | | RSRV |
| 51 | YARS | YARASHIP AS | | | SCAC4 |
| 52 | YARU | Yamaruji Nostalgic Railway | | | TRAFFIC |
| 53 | YASA | YA SA DENIZCILIK SANAYI VE TICARET | | | SCAC4 |
| 54 | YASS | YUSEN LOGISTICS (AMERICAS) INC | | | SCAC4 |
| 55 | YASV | YUSEN LOGISTICS (AMERICAS) INC | | | SCAC4 |
| 56 | YATI | YAMATO TRANSPORT U S A INC | | | SCAC4 |
| 57 | YATJ | YATER, JOE INC | | | SCAC4 |
| 58 | YATP | YATES TRUCKING COMPANY | | | SCAC4 |
| 59 | YATS | Yatsenko | | SU | TRAFFIC |
| 60 | YAZ | CENTURY 21 PLANT | | | PWRC |
| 61 | YAZM | YAZMIN TRUCKING | | | SCAC4 |
