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This index uses the Phonetic (spoken) Alphabet.

Alpha Bravo Charlie Delta Echo Foxtrot Golf Hotel India Juliet Kilo Lima Mike November Oscar Papa Quebec Romeo Sierra Tango Uniform Victor Whiskey X-ray Yankee Zulu

Underwater Locator Beacon. A device attached to aviation flight recorders that when immersed in water emits an acoustic signal, to assist with locating an aircraft’s Flight Data Recorder and Cockpit Voice Recorder. (Source: ATSB)
Uncertainty phase
A situation wherein doubt exists as to the safety of an aircraft or a marine vessel, and the Persons on board.
Unidentified aircraft
unidentified aircraft
An aircraft that has been observed or reported to be operating in a given area but whose identity has not been established.
United States
United States of America