Which of the following is not a component of landing distance calculations?

In landing distance calculations, various factors are considered to ensure a safe and effective landing. These factors include speed at touchdown, which directly impacts how much runway the aircraft will need to come to a complete stop; wind conditions, as they can affect the aircraft's performance and required landing distance; and flap settings, which influence lift and drag characteristics and can therefore alter the landing distance.

Aircraft altitude, however, is not a direct component in calculating landing distance. While altitude can affect aircraft performance in general (for example, higher altitudes can lead to different aerodynamic properties), it does not directly factor into the equation when determining the distance required to land an aircraft on a runway at sea level. The primary considerations in landing distance are specific to the conditions and configurations present during the landing phase itself, rather than the altitude from which the aircraft is approaching.