Known traffic

KNOWN TRAFFIC- With respect to ATC clearances, means aircraft whose altitude, position, and intentions are known to ATC.
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Any known traffic delays advised by ATC
Runway lengths at airports of intended use
Fuel requirements
You need enough fuel to fly to this airport, fly to an alternate and fly thereafter for 45 minutes at normal cruise. FAR 91.167 ...

U
Airspace Euro control project Class U (unknown traffic)
U/S
unserviceable ...

This service consists of providing information to landing and departing aircraft concerning wind direction and velocity, favored runway, altimeter setting, pertinent known traffic, pertinent known field conditions, ...

See also: Aircraft, Altitude, Clearance, Direct, Pilot