What marks the end of the takeoff phase for an aircraft?

The end of the takeoff phase for an aircraft is marked by reaching a specific altitude that indicates a successful transition from the ground to the air. In aviation, this is commonly established at 1000 feet above runway elevation. At this altitude, the aircraft is typically past the obstacles in the immediate vicinity of the airport and has reached a level of flight where it is clear of the ground's influence and can continue to climb and maneuver safely.

This altitude is significant because it allows the pilots to consider that they have achieved a stable ascent and can engage in further flight procedures, such as retracting landing gear and configuring the aircraft for cruise flight. Reaching this altitude also aligns with regulatory standards for aircraft performance and safety, ensuring that the aircraft is on a safe trajectory away from any potential ground-based hazards.

In contrast, other options either focus on aspects of landing or lower altitudes that do not signify the transition to the climb-out phase. Achieving 35 feet above runway elevation may occur earlier during the takeoff sequence, but it does not indicate that the aircraft has successfully transitioned into the climb phase, while completing a successful landing and exiting the runway after landing are actions that occur after the takeoff phase has concluded.