Bucharest Henri Coandă International Airport — Otopeni, Romania

Henri Coandă, the Romanian engineer credited with pioneering jet propulsion concepts and the aerodynamic phenomenon that bears his name, gives OTP its title, and the airport anchors Romania's air travel network from its site in Otopeni, north of Bucharest, having eclipsed the older, more central Băneasa airport for nearly all international traffic. It stands as by far the country's busiest airport, serving as the primary base for TAROM, the national carrier, while Wizz Air has built an extensive network of budget routes spanning much of Europe from a base there. Terminal expansions over the past two decades have repeatedly struggled to keep pace with passenger growth, as Bucharest's economy and tourism sector have expanded since Romania joined the European Union in 2007. The airport connects the capital to destinations across Europe, the Middle East, and beyond, functioning as the country's principal gateway for business travelers and for Romania's large diaspora returning to visit family.