Edinburgh Airport — Ingliston, Edinburgh, United Kingdom

Edinburgh Airport, known by the code EDI, stands as Scotland's busiest airport, positioned at Ingliston on the western edge of the capital within sight of the Pentland Hills. A tram line completed in the mid-2010s finally gave travelers a direct link into Edinburgh's city center, ending decades of reliance on buses and taxis for the final stretch of the journey. Passenger numbers spike dramatically each August when the Edinburgh Festival Fringe, widely described as the world's largest arts festival, draws performers and audiences from around the globe, straining the single-runway airport's capacity during an otherwise manageable summer peak. Budget carriers alongside legacy European and transatlantic airlines operate from EDI, and direct long-haul routes to North America have expanded gradually, a shift from the airport's earlier reliance on connections through London.