What procedure applies when approaching an airport with an operating control tower?

When approaching an airport with an operating control tower, establishing two-way radio communication with the tower prior to entering Class D airspace is the correct procedure. This is essential because it ensures that the aircraft is properly sequenced into the traffic pattern and that the pilots are informed of any relevant instructions or traffic that may affect their approach and landing. The communication helps maintain safety in the airspace surrounding the airport and allows for effective management of arriving and departing aircraft.

In this scenario, the approach entails informing the tower of your intentions and receiving specific clearance, which is crucial for safe and orderly operations. This interaction is a fundamental part of flying in controlled airspace, where the tower requires communication to coordinate aircraft movements.

Other options present less safe or inappropriate actions, such as flying directly to the runway without communication, which could lead to unsafe situations. Circling the airport until instructed can lead to unnecessary delays and increased air traffic congestion, while contacting the nearest approach control is generally not the appropriate procedure when you are specifically approaching a towered airport where direct communication with the tower is necessary.