"COLIN LAMB" wrote in message
nk.net...
4. How high does Class A airspace extend?

Hey, it is Friday. The first question popped up this afternoon during a
practice autorotation. All the way back from the airport, the questions
kept coming.

Colin

18,000 up to and including FL 600 is Class A. Above that, it's clase E .

Part 71.31 defines Class A
Part 71.71 defines Class E

Tim Ward