when the weather minimums are below basic VFR. when the associated control tower is in operation. when the associated Flight Service Station is in operation.
Understanding Airspace
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The airspace reverts to Class E or a combination of Class E and G airspace during the hours the tower is not in operation. The airspace designation normally will not change.
Shaded Blue Solid Magenta Solid Blue
Solid Magenta Shaded Magenta Solid Blue
Class A is not charted. A solid and dotted magenta line A solid gray line
is required to file a flight plan. must use a visual observer. is required to receive ATC authorization.

