Nontowered Airport - An airport without a control tower - the majority of America's 13,000 airports. Only 680 airports have control towers. Nontowered airports are far from being uncontrolled.
Unicom: A common, multi-purpose radio frequency used at most nontowered airports as the Common Traffic Advisory Frequency. AOPA coined the term (derived from the words "universal communications") in the 1950s.
 See also: ATC, VFR, Speed, AGL, Air traffic
  
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