Airspace: Class A. Altitude: 18,000–60,000 feet. This highly regulated slice of sky incorporates jet routes, where jet-powered drones could share the sky with airliners, ...

Class B covers the busiest, most complex airspace in the United States, such as Dallas-Fort Worth International Airport. [Credit: Shutterstock] You can go your entire private pilot career and ...

Class A airspace is the sky above the base altitude of about 24,500 feet (7,467 meters) above mean sea level, according to IATA. In it, all flights must be cleared by air traffic control, ...