| 1 | Y0 | Friendship Airways d/b/a Yellow Air Taxi | ICAO: FCB, Callsign: Checkerbrire, Designator Y0 reinstated by IATA | USA | AVCODES |
| 2 | Y0 | Friendship Airways d/b/a Yellow Air Taxi | ICAO: EMJ, Callsign: Light House, Founded in 2003. Ceased operations. | USA | AVCODES |
| 3 | Y1 | Travel Technologyu Interactive SA | Computer Reservations Systems (CRS) | F | AVCODES |
| 4 | Y2 | African Joint Air Services d/b/a Alliance Air | ICAO: AFJ, Callsign: Jambo, IATA Prefix: 693, Ceased operations on 08 October 2000. | EAU | AVCODES |
| 5 | Y2 | Cygnus Air, S.A. | ICAO: RGN, Callsign: Cygnus Air, IATA Prefix: 571, Name changed from Regional Lineas Aereas. ICAO callsign changed from Regional Lineas. Designator XG* recalled by IATA | E | AVCODES |
| 6 | Y2 | Globespan Airways Limited t/a Flyglobespan | ICAO: GSM, Callsign: Globespan, IATA Prefix: 060, Ceased operations on 16 December 2009. Designator Y2 reinsated by IATA. IATA designator change from B4 | GB | AVCODES |
| 7 | Y2 | Air Century, S.A. | ICAO: CEY, Callsign: Centuryflight, | DOM | AVCODES |
| 8 | Y258 | TRANSPAC CONT SVS (WIL 136/139) | | | SCAC4 |
| 9 | Y3 | Worldwide Cargo Services, Inc. | Name changed to Driessen Services, Inc. Designator Y3* reinstated by IATA | USA | AVCODES |
| 10 | Y3 | Driessen Services, Inc. | Name changed from Worldwide Cargo Services, Inc. Designator Y3* reinstated by IATA | USA | AVCODES |
| 11 | Y3 | Sky KG Airlines | ICAO: KGK, Callsign: Kyrgyz Sky, Designator Y3 recalled by IATA. | KS | AVCODES |
| 12 | Y3 | Gryphon Airlines SA (Pty) Ltd | ICAO: GRF, Callsign: Simba, Designator Y3 recalled by IATA. | ZA | AVCODES |
| 13 | Y3 | Syphax Airlines S A | ICAO: SYA, Callsign: Syphax, | TN | AVCODES |
| 14 | Y4 | Eagle Aviation Ltd. | ICAO: EQA, Callsign: Magnum, IATA Prefix: 067, Ceased operations. | EAK | AVCODES |
| 15 | Y4 | Concesionaria Vuela Compania De, SA de CV (Volaris) | ICAO: VOI, Callsign: Vuela Aviacion, IATA Prefix: 036, ICAO callsign changed to Volaris | MEX | AVCODES |
| 16 | Y4 | Concesionaria Vuela Compania De, SA de CV (Volaris) | ICAO: VOI, Callsign: Volaris, IATA Prefix: 036, ICAO callsign changed from Vuela Aviacion | MEX | AVCODES |
| 17 | Y5 | Inter Trans Avia | ICAO: ITD, Callsign: Seitek, | KS | AVCODES |
| 18 | Y5 | Arax Airways | ICAO: RXR, Designator Y5 recalled by IATA | AM | AVCODES |
| 19 | Y5 | Pace Airlines, Inc | ICAO: PCE, Callsign: Pace, Established in January 1996. Ceased operations September 2009. Name changed from Piedmont Aviation Services, Inc. d/b/a Pace Airlines w.e.f December 2002. | USA | AVCODES |
| 20 | Y5 | Aircompany Asia Wings JSC | ICAO: AWA, Ceased operations during 2012. | KZ | AVCODES |
| 21 | Y5 | Golden Myanmar Airlines Public Co., Ltd | ICAO: GMR, Callsign: Golden Myanmar, IATA Prefix: 509, Established in August 2012. Commenced operations on 11 January 2013. Ceased operations. | MYA | AVCODES |
| 22 | Y6 | Europe Elite | ICAO: VIP, Callsign: Vestal, Paper Airline only. | GB | AVCODES |
| 23 | Y6 | Cambodia Airlines Co. Ltd. | ICAO: KHM, Callsign: Cambodia Airlines, IATA designator changed to DI. Designator Y6* reinstated by IATA | K | AVCODES |
| 24 | Y6 | PT. Metro Batavia | ICAO: BTV, Callsign: Batavia, Founded in 2002. Ceased operations on 31 January 2013. | RI | AVCODES |
| 25 | Y6 | AB Aviation | ICAO: CIK, Callsign: Comoros Airline, | COM | AVCODES |
| 26 | Y7 | Trans Air Benin | ICAO: TNB, Callsign: Trans-Benin, | DY | AVCODES |
| 27 | Y7 | Iran Asseman Airlines | IATA designator changed to EP | IR | AVCODES |
| 28 | Y7 | Flyjet Limited | ICAO: FJE, Callsign: Envoy, IATA Prefix: 362, Name changed to Flyjet Limited t/a Silverjet. ICAO callsign changed from Jetsfly | GB | AVCODES |
| 29 | Y7 | Silverjet plc | ICAO: SLR, Callsign: Silverjet, IATA Prefix: 362, Ceased operations on 30 May 2008. | GB | AVCODES |
| 30 | Y7 | Flyjet Limited t/a Silver | ICAO: FJE, Callsign: Envoy, IATA Prefix: 362, Name changed from Flyjet Limited. ICAO callsign changed from Jetsfly | GB | AVCODES |
| 31 | Y7 | Joint-stock company NordStar Airlines d/b/a NordStar | ICAO: TYA, Callsign: Taimyr, IATA Prefix: 476, Name changed from Open Joint Stock Company Airline Taimyr d/b/a NordStar. | RUS | AVCODES |
| 32 | Y7 | Aerodynamics, Inc. | ICAO: DNJ, ICAO designator changed to DYN | USA | AVCODES |
| 33 | Y7 | Aerodynamics, Inc. | ICAO: DYN, Callsign: Aerodynamics, IATA designator changed to 8N*. Name changed from Aero Dynamics, Inc. ICAO callsign from Aero Dynamic | USA | AVCODES |
| 34 | Y7 | Open Joint Stock Company Airline Taimyr d/b/a NordStar | ICAO: TYA, Callsign: Taimyr, IATA Prefix: 476, Name changed to Joint-stock company NordStar Airlines d/b/a NordStar. Founded on 17 December 2008. Commenced operations on 17 June 2009. | RUS | AVCODES |
| 35 | Y8 | Passaredo Transportes Aereos, S.A. | ICAO: PTB, Callsign: Passaredo, IATA Prefix: 837, Ceased operations on 18 April 2002. | BR | AVCODES |
| 36 | Y8 | Sayany Airlines | ICAO: SYL, Callsign: Sayany, | RUS | AVCODES |
| 37 | Y8 | Yangtze River Express Airlines Co., Ltd. | ICAO: YZR, Callsign: Yangtze River, Name changed to Yangtze River Airlines Co., Ltd. w.e.f. 28 November 2015. | PRC | AVCODES |
| 38 | Y8 | JSC Airline Yakutia | ICAO: SVL, Callsign: Air Yakutia, Designator Y8* recalled by IATA | RUS | AVCODES |
| 39 | Y8 | Yangtze River Airlines Co., Ltd. | ICAO: YZR, Callsign: Yangtze River, Name changed to Suparna Airlines Co., Ltd. On 07 July 2017. Name changed from Yangtze River Express Airlines Co., Ltd. w.e.f. 28 November 2015. | PRC | AVCODES |
| 40 | Y8 | Suparna Airlines Co., Ltd. | ICAO: YZR, Callsign: Yangtze River, Name changed from Yangtze River Airlines Co., Ltd. w.e.f. 07 July 2017. Name previously changed from Yangtze River Express Airlines Co., Ltd. w.e.f. 28 November 2015. | PRC | AVCODES |
| 41 | Y9 | Kish Air | ICAO: IRK, Callsign: Kishair, IATA Prefix: 780, ICAO Designator changed to KIS. | IR | AVCODES |
| 42 | Y9 | Kish Air | ICAO: KIS, Callsign: Kishair, IATA Prefix: 780, ICAO Designator changed from IRK. | IR | AVCODES |
| 43 | Y9 | 1263343 Alberta Inc t/a Enerjet | ICAO: DAT, Callsign: Dauntless, Name changed to 1263343 Alberta Inc t/a Lynx Air. | CDN | AVCODES |
| 44 | Y9 | 1263343 Alberta Inc t/a Lynx Air | ICAO: DAT, Callsign: Dauntless, Name changed from 1263343 Alberta Inc t/a Enerjet. | CDN | AVCODES |
| 45 | YA | Yeti Airlines (P) Ltd. | | NEP | AVCODES |
| 46 | YAAF | YAAHOO TRANSPORT LOGISTICS LINK | | | SCAC4 |
| 47 | YABM | YATES, DON TRUCKING INC | | | SCAC4 |
| 48 | YAEG | YAEGER TRANSPORT INC | | | SCAC4 |
| 49 | YAEL | YAEL TRUCKING | | | SCAC4 |
| 50 | YAFM | Yemeni Armed Forces | | YE | TRAFFIC |
| 51 | YAGE | Y II AGENCY INC | | | SCAC4 |
| 52 | YAGG | YAGGY, STEVE SPECIALIZED TRUCK SERV | | | SCAC4 |
| 53 | YAGR | YAGER BROS INC | | | SCAC4 |
| 54 | YAK | Yak Design Bureau | Callsign: Yak Avia, | RUS | AVCODES |
| 55 | YAK | Yakolev | | | ICAO1 |
| 56 | YAKM | YAKIMA OIL CO INC | | | SCAC4 |
| 57 | YAKU | YAKUTSK CONTAINER AGENCY LLC | | RUS | BIC |
| 58 | YAMAS | Yamasaki Kanko | | J | TRAFFIC |
| 59 | YAMI | YOUNG, ALLEN MOVERS INC | | | SCAC4 |
| 60 | YAMK | YAMKO TRUCK LINES, INC. | | | SCAC1 |
| 61 | YAMK | YAMKO TRUCK LINES | | | SCAC4 |
| 62 | YAML | YANKEE LINES INC | | | PWRC |
| 63 | YAMO | YAM CITY OIL CO INC | | | SCAC4 |
| 64 | YAMU | YAMATO CUSTOMS BROKERS | | | SCAC4 |
| 65 | YAN | Yancey R.R. Co. | 1/1975; added 1/1980; 1/1980; eliminated 10/1989 | | NAKINA |
| 66 | YAN | Yancey R.R. Co. | 1/75; added 1/80; 1/80; eliminated 10/89 | | NRHS |
| 67 | YAN | YANCY RAILROAD | | | PWRC |
| 68 | YAN | Yancey Railroad | | | RSRV |
| 69 | YAND | YANDELL TRUCKAWAY INC | | | SCAC4 |
| 70 | YANG | YANG LINE | | | SCAC4 |
| 71 | YANK | YANKEE PRIDE TRANSPORT INC | | | SCAC4 |
| 72 | YANKEE | Yankee Trails | | USA | TRAFFIC |
| 73 | YANT | YAN TRANSPORT LOGISTIC | | | SCAC4 |
| 74 | YAP | Yes Airways SP z.o.o. | Callsign: Whitekeko, Name changed to OLT Express Polski | PL | AVCODES |
| 75 | YAPAK | | City: Yakutsk | RUS | TRAFFIC |
| 76 | YARA | Yara Rostock Zweigniederlassung der Yara GmbH & Co. KG | | DE | VKM |
| 77 | YARAF | Yara Suomi Oy | | FI | VKM |
| 78 | YARB | YARBROUGH TRANSFER COMPANY | | | SCAC1 |
| 79 | YARB | YARBROUGH TRANSFER COMPANY | | | SCAC4 |
| 80 | YARE | YARZA RODRIGUEZ, MARIA EUGENIA | | | SCAC4 |
| 81 | YARL | YARMOUTH LUMBER INC | | | SCAC4 |
| 82 | YARR | Youngstown & Austintown R.R., Inc. | added 4/1985 | | NAKINA |
| 83 | YARR | Ohio R.R. System | eliminated 10/1992 | | NAKINA |
| 84 | YARR | Columbus & Ohio River R.R. Co., Inc. | added 10/1992 | | NAKINA |
| 85 | YARR | Youngstown & Austintown R.R., Inc. | 1/1994-7/2005 | | NAKINA |
| 86 | YARR | Youngstown & Austintown R.R., Inc. | added 4/85 | | NRHS |
| 87 | YARR | Ohio R.R. System | eliminated 10/92 | | NRHS |
| 88 | YARR | Columbus & Ohio River R.R. Co., Inc. | added 10/92 | | NRHS |
| 89 | YARR | Youngstown & Austintown R.R., Inc. | 1/94-7/2000 | | NRHS |
| 90 | YARR | YOUNGSTOWN & AUSTINTOWN RAILROAD, INC. | | | PWRC |
| 91 | YARR | Youngstown and Austintown Railroad | | | RSRV |
| 92 | YARS | YARASHIP AS | | | SCAC4 |
| 93 | YARU | Yamaruji Nostalgic Railway | | | TRAFFIC |
| 94 | YASA | YA SA DENIZCILIK SANAYI VE TICARET | | | SCAC4 |
| 95 | YASS | YUSEN LOGISTICS (AMERICAS) INC | | | SCAC4 |
| 96 | YASV | YUSEN LOGISTICS (AMERICAS) INC | | | SCAC4 |
| 97 | YATI | YAMATO TRANSPORT U S A INC | | | SCAC4 |
| 98 | YATJ | YATER, JOE INC | | | SCAC4 |
| 99 | YATP | YATES TRUCKING COMPANY | | | SCAC4 |
| 100 | YAZ | CENTURY 21 PLANT | | | PWRC |
