| IATA
| ICAO
| Airline
| Call sign
| Country
| Comments
|
|
| UEU
| United European Airlines
| UNITED EUROPEAN
| Romania
| 2014[1]
|
|
| UCG
| Uniworld Air Cargo
| UNIWORLD
| Panama
| 2014[1]
|
|
| CUH
| Urumqi Airlines
| LOULAN
| China
| 2014[1]
|
|
| DOD
| USAF Air Mobility Operations Control Center
|
| United States
|
|
|
| DOI
| U.S. Department of the Interior
| INTERIOR
| United States
| Office of Aircraft Services
|
|
| CNV
| U.S. Navy Reserve Logistic Air Forces
| CONVOY
| United States
| U.S. Navy Reserve Logistic Air Forces, New Orleans, LA, USA
|
|
| EXM
| United Kingdom Civil Aviation Authority
| EXAM
| United Kingdom
| CAA Flight Examiners
|
|
| GIH
| Union des Transports Africains de Guinee
| TRANSPORT AFRICAIN
| Guinea
|
|
|
| GKA
| US Army Parachute Team
| GOLDEN KNIGHTS
| United States
|
|
|
| GWY
| USA3000 Airlines
| GETAWAY
| United States
| was U5
|
| B7
| UIA
| UNI Air
| GLORY
| Taiwan
|
|
|
| UAB
| United Arabian Airlines
| UNITED ARABIAN
| Sudan
|
|
| UA
| UAL
| United Airlines
| UNITED
| United States
|
|
| 4H
| UBD
| United Airways
| UNITED BANGLADESH
| Bangladesh
|
|
|
| UAC
| United Air Charters
| UNITAIR
| Zimbabwe
|
|
|
| UCS
| United Carriers Systems
| UNITED CARRIERS
| United States
|
|
|
| UEA
| United Eagle Airlines
| UNITED EAGLE
| China
|
|
|
| UFS
| United Feeder Service
| FEEDER EXPRESS
| United States
| formerly part of United Express
|
|
| CFU
| United Kingdom Civil Aviation Authority
| MINAIR
| United Kingdom
| Civil Aviation Authority Flying Unit
|
|
| KRF
| United Kingdom Royal VIP Flights
| KITTYHAWK
| United Kingdom
| In Military Aircraft
|
|
| KRH
| United Kingdom Royal VIP Flight
| SPARROWHAWK
| United Kingdom
| In Civil Chartered Aircraft
|
|
| SDS
| United Kingdom Civil Aviation Authority
| STANDARDS
| United Kingdom
| Training Standards
|
|
| TQF
| United Kingdom Royal VIP Flights
| RAINBOW
| United Kingdom
| Helicopter Flights
|
|
| CGX
| United States Coast Guard Auxiliary
| COASTGUARD AUXAIR
| United States
|
|
|
| AGR
| United States Department Of Agriculture
| AGRICULTURE
| United States
|
|
|
| UAD
| University Air Squadron
|
| United Kingdom
| MOD Boscombe Down
|
|
| UAJ
| University Air Squadron
|
| United Kingdom
| Glasgow
|
|
| UAA
| University Air Squadron
|
| United Kingdom
| Leuchars
|
|
| UAS
| University Air Squadron
|
| United Kingdom
| RAF Cranwell
|
|
| HBU
| Universal Avia
| KHARKIV UNIVERSAL
| Ukraine
|
|
|
| HLE
| UK HEMS
| HELIMED
| United Kingdom
|
|
| U7
| JUS
| USA Jet Airlines
| JET USA
| United States
|
|
|
| LEA
| Unijet
| LEADAIR
| France
|
|
|
| MSH
| US Marshals Service
| MARSHALAIR
| United States
| US Department of Justice
|
|
| NDU
| University of North Dakota
| SIOUX
| United States
|
|
|
| PNA
| Universal Airlines
| PACIFIC NORTHERN
| United States
|
|
|
|
| Upali Air
| UPALI
| Sri Lanka
| defunct
|
|
| RAU
| Uganda Royal Airways
| UGANDA ROYAL
| Uganda
|
|
|
| SAU
| United Aviation Services
| UNISERVE
| Spain
|
|
| U6
| SVR
| Ural Airlines
| SVERDLOVSK AIR
| Russia
|
|
|
| TRB
| Ukraine Transavia
| KIROVTRANS
| Ukraine
|
|
|
| UAF
| United Arab Emirates Air Force
| UNIFORCE
| United Arab Emirates
|
|
|
| UAI
| Union Africaine des Transports
| UNAIR
| Ivory Coast
|
|
|
| UCC
| Uganda Air Cargo
| UGANDA CARGO
| Uganda
|
|
|
| UCH
| US Airports Air Charter
| US CHARTER
| United States
|
|
|
| UCO
| Ucoaviacion
| UCOAVIACION
| Spain
|
|
|
| UES
| Ues-Avia Aircompany
| AVIASYSTEM
| Ukraine
|
|
| QU
| UGA
| Uganda Airlines (1976–2001)
| UGANDA
| Uganda
| Ceased operations 2001
|
| UR
| UGD
| Uganda Airlines
| CRESTED
| Uganda
| Started operations in 2019
|
|
| UGC
| Urgemer Canarias
| URGEMER
| Spain
|
|
|
| UHL
| Ukrainian Helicopters
| UKRAINE COPTERS
| Ukraine
|
|
|
| UHS
| Ulyanovsk Higher Civil Aviation School
| PILOT AIR
| Russia
|
|
|
| UJR
| Universal Jet Rental de Mexico
| UNIVERSAL JET
| Mexico
|
|
|
| UJT
| Universal Jet Aviation
| UNI-JET
| United States
| Cancelled 2014 - Renamed Journey Aviation with code JNY
|
|
| UKI
| UK International Airlines
| KHALIQ
| United Kingdom
|
|
|
| UKL
| Ukraine Air Alliance
| UKRAINE ALLIANCE
| Ukraine
|
|
| UF
| UKM
| UM Airlines
| UKRAINE MEDITERRANEE
| Ukraine
| Ukraine Mediterranean Airlines
|
|
| UKN
| Ukraine Air Enterprise
| ENTERPRISE UKRAINE
| Ukraine
|
|
|
| UKP
| National Police Air Service
| POLICE
| United Kingdom
|
|
| 6Z
| UKS
| Ukrainian Cargo Airways
| CARGOTRANS
| Ukraine
|
|
|
| ULT
| Ultrair
| ULTRAIR
| United States
|
|
|
| ULH
| Ultimate HELI
| ULTIMATEHELI
| South Africa
| Ultimate HELI (Pty) Ltd
|
|
| ULR
| Ultimate Air
| VIPER
| South Africa
| Ultimate Airways (Pty) Ltd
|
| OL
| ULS
| Ultra Air
| AIR ULTRA
| Colombia
|
|
|
| UNC
| Uni-Fly
| UNICOPTER
| Denmark
|
|
|
| UNF
| Union Flights
| UNION FLIGHTS
| United States
|
|
|
| UNJ
| Universal Jet
| PROJET
| Spain
|
|
|
| UNS
| Unsped Paket Servisi
| UNSPED
| Turkey
|
|
|
| UNU
| Unifly Servizi Aerei
| UNIEURO
| Italy
|
|
|
| UPL
| Ukrainian Pilot School
| PILOT SCHOOL
| Ukraine
|
|
| 5X
| UPS
| United Parcel Service
| UPS
| United States
|
|
|
| URV
| Uraiavia
| URAI
| Russia
|
|
| US
| AWE
| US Airways
| CACTUS
| United States
| defunct, merged with American Airlines in 2015
|
| BS
| UBG
| US-Bangla Airlines
| BANGLA STAR
| Bangladesh
|
|
|
| USF
| USAfrica Airways
| AFRICA EXPRESS
| United States
|
|
| UH
| USH
| US Helicopter
| US-HELI
| United States
|
|
|
| USJ
| US Jet
| USJET
| United States
|
|
|
| USX
| US Express
| AIR EXPRESS
| United States
|
|
| QU
| UTN
| Skyline Express
| Skyline Express Airline
| Ukraine
|
|
|
| TUM
| UTAir
| UTAIR-CARGO
| Russian Federation
| 2014[1]
|
| UT
| UTA
| UTair Aviation
| UTAIR
| Russia
| WAS P2 till 2006
|
|
| UTR
| Utair South Africa
| AIRUT
| South Africa
|
|
|
| UTS
| Ukrainian State Air Traffic Service Enterprise
| AIRRUH
| Ukraine
|
|
|
| UTU
| Urartu-Air
|
| Armenia
|
|
|
| UVA
| Universal Airways
| UNIVERSAL
| United States
|
|
|
| UVG
| Universal Airlines
| GUYANA JET
| Guyana
|
|
|
| UVM
| Uvavemex
| UVAVEMEX
| Mexico
|
|
|
| AIO
| United States Air Force
| AIR CHIEF
| United States
| Chief of Staff
|
|
| UVN
| United Aviation
| UNITED AVIATION
| Kuwait
|
|
| HY
| UZB
| Uzbekistan Airways
| UZBEK
| Uzbekistan
|
|
| PS
| AUI
| Ukraine International Airlines
| UKRAINE INTERNATIONAL
| Ukraine
|
|
|
| WEC
| Universal Airlines
| AIRGO
| United States
|
|
| US
|
| Unavia Suisse
|
| Switzerland
|
|
|
| QID
| USAF 100th Air Refueling Wing
| QUID
| United States
|
|
|
| UIT
| University of Tromsø School of Aviation
| ARCTIC
| Norway
|
|
|
| UNO
| United Nations
| UNITED NATIONS
| n/a
| UNOxxx followed by P(peacekeeping), or H(Humanitarian)
|