| 1 | UW | Universal Airlines, Inc. | ICAO: UVG, Callsign: Guyana Jet, IATA Prefix: 751, Designator UW recalled by IATA | GUY | AVCODES |
| 2 | UW | Perimeter Aviation Ltd. | ICAO: PAG, Callsign: Perimeter, Designator UW recalled by IATA | CDN | AVCODES |
| 3 | UW | Air Rwanda | ICAO: SAR, Callsign: Uniform Whiskey, IATA desigantor changed to RY | RWA | AVCODES |
| 4 | UW | Uni-Top Airlines | ICAO: UTP, Callsign: Uni-Top, Ceased operations on 29 November 2019. | PRC | AVCODES |
| 5 | UWA | South East Aviation Holding, Inc. | Callsign: Grumpy, Name changed to United West Airlines, Inc. | USA | AVCODES |
| 6 | UWA | United West Airlines, Inc. | Callsign: Grumpy, Name changed from South East Aviation Holding, Inc. | USA | AVCODES |
| 7 | UWAG | Überlandwerke Fulda AG | City: Vilnius | D | TRAFFIC |
| 8 | UWAJIMA | Uwajima Bus | | J | TRAFFIC |
| 9 | UWAL | UNITEDWAY WAREHOUSE AND LOGISTICS C | | | SCAC4 |
| 10 | UWAU | UNITED WIN LOGISTICS CO., LTD. | | PRC | BIC |
| 11 | UWAY | UNITED WAY TRANSPORT | | | SCAC4 |
| 12 | UWAY | United Railways SRL | | RO | TRAFFIC |
| 13 | UWCL | UNITED WORLD CARGO LIMITED | | | SCAC4 |
| 14 | UWCT | UWC TRANSPORTATION LLC | | | SCAC4 |
| 15 | UWD | Skyward Aviation | Callsign: Upward, | USA | AVCODES |
| 16 | UWDL | ULTIMATE WINDOWS & DOORS LTD | | | SCAC4 |
| 17 | UWDT | UNDERWOOD TRUCKING INCORPORATED | | | SCAC4 |
| 18 | UWEM | UNIWARD SHIPPING COMPANY LIMITED | | | SCAC4 |
| 19 | UWFF | UWFOUR (UW4) FILM PRODUCTIONS INC | | | SCAC4 |
| 20 | UWGL | UNDERWOOD, GARY L | | | SCAC4 |
| 21 | UWHJ | Uddevalla - Vänersborg - Herrljunga Järnväg | 1900 - 1940 | S | svenska-lok.se |
| 22 | UWJ | Ukrainian Wings | Callsign: Ukrainian Wings, | UA | AVCODES |
| 23 | UWLC | UWT INC | | | SCAC4 |
| 24 | UWLD | UNITED WORLD LINE | | | SCAC4 |
| 25 | UWOR | UNSWORTH INTERNATIONAL CONTAINERLIN | | | SCAC4 |
| 26 | UWPC | UW PROVISION COMPANY INC | | | SCAC4 |
| 27 | UWSB | UNISOURCE WORLDWIDE INC (BROKERAGE | | | SCAC4 |
| 28 | UWSI | UNIVERSAL WELL SERVICES INC | | | SCAC4 |
| 29 | UWTI | UNDERWOOD TRANSPORTATION INC | | | SCAC4 |
| 30 | UWTN | UNIVERSITY OF WESTERN ONTARIO | | | SCAC4 |
| 31 | UWTQ | UWT | | | SCAC4 |
