Innsbruck Airport — Innsbruck, Austria

Tucked into the narrow Inn River valley and hemmed in on nearly every side by the peaks of the Alps, INN presents one of Europe's more demanding approaches, requiring pilots to complete specific mountain-flying training before landing there in poor weather. The airport serves Innsbruck, capital of Tyrol and twice host of the Winter Olympics, and traffic swells dramatically during ski season as visitors from across Europe and beyond arrive for resorts scattered through the surrounding mountain valleys. Runway length is constrained by the terrain, limiting the airport mostly to narrow-body aircraft and charter operations rather than large long-haul jets. Summer brings a second, quieter travel season built around hiking and alpine tourism. Scheduled service links INN to major European cities, while winter charter flights from the United Kingdom and elsewhere add substantial seasonal capacity for skiers heading to Tyrolean slopes.