What does departure clearance authorize?

Departure clearance authorizes an aircraft to proceed from its point of origin to its destination. This authorization is critical as it ensures that the aircraft follows the established air traffic control procedures, which include specific routing, altitude, and any potential restrictions that might be in place. The clearance also provides the pilot with the necessary information for a safe departure and sets expectations for the flight ahead.

The other options do not accurately reflect the purpose of departure clearance. For example, while changes during the flight may occur, they are not part of the initial departure clearance, which is focused solely on the initial phases of flight. Rainy weather precautions, although important for safety, are not explicitly covered by departure clearance. Lastly, while landing at an intermediate airport is a consideration for pilots, this must be coordinated with air traffic control separately, as departure clearance is strictly about starting the journey from the origin to the final destination.