Final answer:
Class B airspace is a type of controlled airspace that is based in low level airspace but can extend up into the high level airspace structure. It is typically found around major airports and has specific requirements and restrictions for aircraft operating within it.
Step-by-step explanation:
The type of controlled airspace that is based in low level airspace and can extend up into the high level airspace structure is known as Class B airspace.
Class B airspace is typically found around major airports and is designed to accommodate high volumes of air traffic. It extends upward from the surface up to a certain altitude and has specific requirements and restrictions for aircraft operating within it. The airspace is controlled and monitored by air traffic controllers to ensure safe and efficient operations.
For example, Class B airspace around an airport may extend from the surface up to 10,000 feet above sea level and have a radius of 10 nautical miles. Aircraft operating within this airspace are required to obtain clearance from air traffic control and follow specific procedures to ensure separation from other aircraft.