All About Airspaces / The Places You Can't Fly In
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The Altimater, What Is the Current Pressure?
There's 27 class bravo air spaces in the united states, more or less. Class a ends at 60 thousand feet above sea level - commercial planes don't fly that. There are three classes of air space: A, B and C. The first two standardize flight levels so pilots can adjust their altimeter for different weather systems as they go up.
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