Definition
A non-government air-ground radio communication station that may provide airport advisory information at certain airports. UNICOM is operated by a private agency at the airport (typically the fixed-base operator) and provides information such as wind, favored runway, known traffic, and field conditions. UNICOM is not an air traffic control service and cannot issue clearances or instructions.
Plain English
A radio frequency at smaller airports where pilots talk to someone on the ground — usually staff at the airport business — to get basic airport information like which runway is in use and what the wind is doing.
Context Anchor
Pilots encounter UNICOM frequencies in airport information listings and may use them when arriving at or departing from airports without an operating control tower.
Derivation
UNICOM is a shortened form of 'Universal Communications,' coined when the FCC set aside common radio frequencies for use at airports without control towers. The 'universal' part reflects that the same frequencies are used nationwide for this purpose.
Why Pilots Care
Supports safe self-announce procedures and service requests at uncontrolled fields where no controller is present.
Intuition Check
Do not assume UNICOM means a controller is giving orders. UNICOM provides airport information; it does not control traffic or authorize takeoff, landing, or taxi.
Example Sentence 1
Ten miles out, the pilot called UNICOM and learned that runway 27 was in use with a light westerly wind.
Example Sentence 2
Contact the FBO on UNICOM to arrange fuel after landing.