IFR flight planning regulations (e.g., 91.167 for fuel, 91.169 for alternates) are primarily pre-flight *planning* rules, not operational restrictions once airborne, allowing pilots to divert from ...
IFR flights require specifying an alternate airport if the destination's forecast weather (one hour before to one hour after ETA) is below a 2000-foot ceiling or three statute miles visibility. Fuel ...
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