Questions tagged [airspace-classes]

Questions about how airspace is divided into classes with differing levels of control over the aircraft therein, how these classes differ from each other, and how they are used.

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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 ...