Definition
An airport whose field elevation is significantly above sea level, where reduced air density measurably affects aircraft and engine performance. There is no single fixed threshold across all sources, but airports above roughly 2,000 feet field elevation are commonly treated as high-altitude for performance and operational planning purposes, with effects becoming more pronounced as elevation increases.
Plain English
An airport that sits high enough above sea level that the thinner air noticeably hurts how well your aircraft takes off, climbs, and lands.
Context Anchor
Seen in performance planning, mountain flying, airport familiarization, and discussions of takeoff and landing at elevated airports.
Derivation
“High” comes from an old English word meaning tall or elevated. “Altitude” comes from the Latin word “altus,” meaning high. In this term, the important idea is the airport’s height above sea level, not how high the airplane is flying over it.
Why Pilots Care
Lower air density reduces engine power, propeller thrust, and wing lift, increasing required runway length and reducing climb rate.
Grounding Statement
Picture trying to take off from a runway on a mountain plateau: the runway may look normal, but the thinner air gives the airplane less lift, less engine power, and less propeller bite.
Intuition Check
Do not read “high-altitude airport” as an airport where airplanes fly high overhead. It means the airport itself is located high above sea level, which changes how the airplane performs.
Example Sentence 1
Before flying into Leadville, Colorado, the student reviewed high-altitude airport procedures and recalculated takeoff distance using density altitude.
Example Sentence 2
Landing distance at a high-altitude airport increased because the thinner air produced less drag and less braking effectiveness.