What does a pilot require to enter Class B airspace?

Answer: B — clearance from air traffic control

To enter Class B airspace, a pilot is required to obtain a clearance from air traffic control. This requirement is rooted in the nature of Class B airspace, which is generally designated around the busiest airports to ensure the safe and efficient flow of air traffic. Class B airspace encompasses a more complex traffic environment, where aircraft are operating in closer proximity to one another, including both commercial airliners and general aviation aircraft. Therefore, the clearance is essential to ensure that pilots are aware of and can safely navigate the controlled airspace, integrating with the existing traffic and adhering to specific operating procedures set by air traffic control. The clearance ensures that the pilot has the right to enter, transit through, or operate within this high-density environment, facilitating coordination between the pilot and ATC for safe separation and management of air traffic. Options that suggest a permit from the airport or specific aircraft types are unnecessary for entry into Class B airspace, as the focus is primarily on obtaining clearance from ATC rather than specific aircraft characteristics or prior experience.