What does a displaced threshold reduce?

A displaced threshold is used in aviation to designate a portion of the runway that is not suitable for landing but can still be utilized for takeoffs. By shifting the threshold further down the runway, it effectively shortens the distance available for landing operations, as aircraft must touchdown beyond this threshold.

This implementation is often done to provide a safer landing zone, especially if the area beyond the displaced threshold might be obstructed or if it cannot support the landing weight of incoming aircraft. While the takeoff distance remains the same, the landing distance is effectively reduced because pilots must account for this new threshold when planning their approach.

Thus, the correct answer focuses on the impact of a displaced threshold on landing operations specifically.