Airspace between 18,000 and 60,000 feet MSL over the conterminous United States. IFR clearances are required for all aircraft operating in CLASS A airspace. Formerly called the Positive Control Area
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14 CFR 1.1 16G Abbreviation Acronym Aerodynamics Aircraft Airline Airlines Airport Airports Airworthiness AMT ATC Aviation Safety Aviation Weather Avionics Bird Strike Engineering ETOPS FAA FAA Pilot's Handbook Flight Flying Human Factors ICAO Icinig Inspection Instruments International Landing Maintenance Military Navigation NextGen Parts Pilot Technique Powerplant Regulatory Safety Seats Structures Systems Tires UK Weather
