What are the four classes of controlled airspace?

Answer: B — Class A, Class B, Class C, and Class D

The correct classification of controlled airspace consists of Class A, Class B, Class C, and Class D. Each class of airspace has specific operational requirements and rules, which are crucial for ensuring safe and efficient aircraft operations. Class A airspace is defined as airspace from 18,000 feet up to and including flight level 600 (FL600) and encompasses the airspace over the entire United States. It requires all pilots to operate under instrument flight rules (IFR) and be in contact with air traffic control (ATC). Class B airspace generally surrounds busy airports and extends from the surface up to a specific altitude, which varies from airport to airport. It requires ATC clearance for aircraft to enter and is designed to manage the high volume of traffic. Class C airspace also surrounds busy airports, but its dimensions are generally smaller than Class B. It requires a two-way radio communication with ATC but does not require clearance to enter, making it less restrictive than Class B. Class D airspace typically surrounds airports with an operational control tower and extends from the surface to a designated altitude. Like Class C, it requires communication with ATC but does not require a clearance for entry. The other options, which include fictional classes and