Altiport

An altiport is an aerodrome for small airplanes and helicopters, situated on or within mountainous terrain. The term is generally confined to describing small mountainous aerodromes in the French Alps.[1] Altiports are generally characterised by having a runway with a pronounced slope, which aids aircraft deceleration when landing and assists acceleration during takeoff. High altitude means less lift so that aircraft need higher speed at takeoff and landing.