Questions tagged [class-a-airspace]

Airspace where only IFR flights are allowed, all flights require ATC clearance, and ATC is responsible for maintaining separation between flights.

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Can single engine aircraft fly in class A airspace?

A friend surprised me the other day by saying that single engined aircraft are not allowed to fly in class A airspace. I understand that the aircraft is under IFR in class A, with ATC clearance, (...
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Why does U.S. airspace revert to class E above flight level 600?

According to Wikipedia, airspace defaults to class E below 18,000 feet AMSL (that is, all airspace below 18,000 feet AMSL is class E unless otherwise specified), whereas all airspace from 18,000 feet ...