Assertion: ceiling | /r/ObjectUse | used for flight planning
Facets:
value: worldwide
type: LOCATION
value: by pilots
type: OTHER
Source sentences:
text: Ceiling is not specifically reported as part of the METAR (METeorological Aviation Report) used for flight planning by pilots worldwide, but can be deduced from the lowest height with broken (BKN) or overcast (OVC) reported.