qv = also in Glossary
U
-
UAS
University Air Squadron -
U-boat
WW1/WW2 German submarine -
UFO
Unidentified Flying Object -
Ultralight
Alternative term for microlight [qv] -
Unit
Relating to a military element; can also be reasonably applied to any form of civil organisation -
United States 3rd Air Force
US military air element based in Britain since shortly after end of WW2 -
United States 8th Army Air Force
More strategic element of US military air forces based in Britain during WW2 -
United States 9th Army Air Force
More tactical element of US military air forces based in Britain during WW2 -
Unlicensed
Relating to civil airfields not permitted to commercially transport passengers or carry out flying training -
Unpaved
Relating to runways consisting of e.g. grass or sand, not hard surfaces such as concrete -
USAAF
United States Army Air Forces (1941-1947) -
USAF
United States Air Force (1947-present) -
USAS
United States Air Service (1918-1926) -
USN
United States Navy -
UXB
Unexploded Bomb