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A comment on US shutdown: Flight delays caused by staff shortages. Parent comment
Civilian flights in Class A airspace (at or above 18,000ft in most places) require an IFR clearance.
State flights can fly "due regard" (VFR) in Class A airspace.
In Hawaii, there is no Class A airspace, and I once controlled a civilian aircraft flying VFR at FL210 (21,000ft).
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Civilian flights in Class A airspace (at or above 18,000ft in most places) require an IFR clearance.
State flights can fly "due regard" (VFR) in Class A airspace.
In Hawaii, there is no Class A airspace, and I once controlled a civilian aircraft flying VFR at FL210 (21,000ft).