Instrument flight rules (IFR) require specialized charts (En Route, STARs, SIDs, Approach Plates) for safe navigation in instrument meteorological conditions (IMC), which differ significantly from ...
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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