Under what circumstances can a pilot fly in controlled airspace?

Flying in controlled airspace requires the pilot to have Air Traffic Control (ATC) permission to ensure safety and orderly traffic management. Controlled airspace is designated around airports where the volume of air traffic is high, and ATC provides instructions and support to all aircraft operating in that airspace. Before entering, a pilot must communicate with ATC, which may involve filing a flight plan or receiving specific clearances to ensure the pilot is aware of other traffic and safe operating procedures.

This requirement emphasizes safety by creating a structured environment where pilots and controllers work together. It helps prevent mid-air collisions and ensures that aircraft follow designated flight routes and maintain safe altitudes. Other options such as flying without permission or merely notifying local authorities do not align with safety protocols, as they could lead to dangerous situations in busy airspace. Additionally, the stipulation about daylight hours is irrelevant to the requirement for ATC clearance, as controlled airspace rules apply regardless of the time of day.