aircraft ceiling"1. After U.S. weather observing practice, the ceiling classification applied when the reported ceiling value has been determined by a pilot while in flight within one and one-half nautical miles of any runway of the airport.
aircraft ceiling, balloon ceiling, estimated ceiling, indefinite ceiling, measured ceiling, precipitation ceiling.
Aircraft Ceiling: The height of the base of the clouds observed and measured with an aircraft.
Aircraft Mishap: An aircraft accident or incident.
Air Discharges: Cloud to air lightning which do not hit the ground.
 See also: Ceiling, Weather, Precipitation, Wind, Earth
  
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