Gibraltar International Airport – Gibraltar: Runway crosses a busy city street, closing traffic for each plane.
Madeira Airport – Portugal: Short, windy runway between mountains and ocean; pilots make last-second maneuvers to avoid Atlantic plunge.
Qamdo Bamda Airport – Tibet: Formerly the world's highest airport; extreme altitude and terrain challenge pilots.
Ketchikan International Airport – Alaska: Short runway with heavy rain and freezing conditions.
Tenzing-Hillary Airport – Lukla, Nepal: High altitude, steep runway, surrounded by Himalayas; daytime landings only.