The FAA has updated its Aviation Weather Advisory Circular (AC 00-6A to AC 00-6B), last revised in 1975, to incorporate modern scientific capabilities like radar and satellite weather, making it a ...
A "pop-up" is an on-the-spot IFR clearance from Air Traffic Control (ATC), often granted without a pre-filed flight plan or briefing, serving as a vital safety option to avoid hazardous scud running.
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