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.
UNICOM - A nongovernment communication facility, which may provide airport information at certain airports. Aeronautical charts and publications show the locations and frequencies of UNICOMs.
UNICOM - Universal Communication. A common radio frequency (usually 121.0 mHz) used at uncontrolled (non-tower) airports for local pilot communication.
UNICOM (Universal Communication) A common radio frequency (usually 121.0 mHz) used at controlled (non-tower) airports for local pilot communication.
CTAF (Common Traffic Advisory Frequency): The radio frequency, also called the UNICOM frequency, used by all traffic at an airport without an operating control tower to coordinate approaches and landings, takeoffs and departures.
The last set of numbers in this line is the local UNICOM frequency. It is used to communicate with the local Fixed Base Operation (FBO) to expedite parking, request fuel, or arrange for ground transportation for example.
Uniform - Reference to UHF Frequency Band
UHF - Ultra High Frequency
UNICOM - Universal Communication
UTC - Universal Co-ordinated Time ...
UNICOM: privately-operated advisory air-to-ground radio service at uncontrolled airfields, in the United States.
Upwind: One of the many words describing the approach segments. See Final for a diagram.
COMMON TRAFFIC ADVISORY FREQUENCY (CTAF)- A frequency designed for the purpose of carrying out airport advisory practices while operating to or from an airport without an operating control tower. The CTAF may be a UNICOM, Multicom, FSS, ...
At the roughly 18,000 airports without control towers (or when the tower is closed), pilots use a pre-assigned UNICOM (universal communications) frequency to communicate with each other and the people at the airport.
A private or corporate pilot could talk with "UNICOM," a fixed base operation (FBO), at an airport to obtain the current weather data, or verify runway operations or to arrange ground transportation or fuelling.
 See also: Aircraft, Pilot, Flight, Altitude, ATC
  
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