Aspen-Pitkin County Airport (Sardy Field) — Aspen, United States

ASE refers to Aspen-Pitkin County Airport, also called Sardy Field, which serves the ski resort town of Aspen, Colorado. Reaching 7,820 feet above sea level, it ranks among the higher-elevation commercial airports in the United States, a factor that limits which aircraft can operate there safely. A single runway sits within a narrow mountain valley, conditions that make approaches more demanding for pilots than at most sea-level fields. Surrounding peaks in the Rocky Mountains further reduce the margin for error during takeoff and landing. Despite these challenges, ASE handles considerable private and commercial traffic, particularly during the winter ski season and summer festival months when visitors flock to Aspen.