What type of airspace commonly surrounds airports with an operational control tower?

Airports with an operational control tower are typically located in Class D airspace. This type of airspace is established around airports that have a control tower, allowing for the management and regulation of air traffic in the vicinity. Class D airspace extends from the surface to a specified altitude, designed to ensure safe and orderly operations for both aircraft departing from and arriving at the airport.

The presence of a control tower is crucial in Class D airspace as it facilitates communication between pilots and air traffic controllers, helping to coordinate aircraft movements and enhance safety. The rules associated with Class D airspace also mandate that pilots establish two-way communication with the control tower before entering the airspace, which underscores the controlled nature of these operations.

In contrast, other classes of airspace have different purposes and operational requirements. For instance, Class B airspace surrounds the busiest airports and requires specific clearances for entry; Class C airspace also has a control tower but typically surrounds airports with a lower level of traffic than Class B; and Class A airspace is designated for high-altitude, high-speed jet routes above 18,000 feet, mainly for instrument flight rules (IFR) operations.