US shutdown: Flight delays caused by staff shortages

Re:US shutdown: Flight delays caused by staff shortages by base698 on Friday January 25, 2019 @11:29AM (#18999495)

Any flight above 17999 ft in class A airspace requires an IFR flight plan. IFR requires controllers for the clearance, release, and approach clearance. Probably what he means....

Most Jets and planes people have experience with would be flying at those altitudes.

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Re:US shutdown: Flight delays caused by staff shortages by Casseres on Friday January 25, 2019 @11:46AM (#18999713)

FYI:

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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