4000 feet AGL. 1200 feet AGL. 1200 feet MSL.
Understanding Airspace
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Class A is not charted. A solid and dotted magenta line A solid gray line
Dashed Blue Dashed Magenta Solid Blue
is required to file a flight plan. must use a visual observer. is required to receive ATC authorization.
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.
Shaded Magenta. Shaded Blue. Dashed Magenta.

