What type of departure is affected by restrictions related to overflight aircraft?

The type of departure that is specifically affected by restrictions related to overflight aircraft is the immediate departure. Immediate departures are typically those that take off as soon as the aircraft receives clearance from air traffic control, without waiting for a standard sequence or clearance interval.

When an aircraft is cleared for an immediate departure, certain conditions or restrictions may apply, particularly in regard to overflight aircraft. These restrictions could be due to maintaining safe separation from other aircraft that are already in the airspace, including those flying over the departure route. Air traffic control must account for these overflight aircraft to ensure safety and efficiency in managing the airspace.

On the other hand, standard departures often follow predefined procedures and are typically planned with built-in separation from other aircraft, which makes them less impacted by immediate overflight concerns. Clearance void departures involve circumstances where the clearance is void if not executed in a timely manner, but those also aren't typically affected by overflight restrictions in the same way that immediate departures are. All departures can encompass a range of procedures, but it is the immediate departures that face specific restrictions regarding overflight aircraft due to the nature of their immediate clearance and subsequent takeoff.