Castellón-Costa Azahar Airport — Castellón de la Plana, Spain

Castellón-Costa Azahar Airport earned an unusual reputation soon after its 2011 opening: for years it handled essentially no scheduled commercial flights, becoming a well-known example in Spain of costly regional infrastructure built ahead of actual demand during the pre-crisis construction boom. Named for the Costa Azahar, the orange-blossom coastline of Spain's Valencia region, CDT eventually attracted low-cost carriers once full certified operations began in earnest years after construction had finished. The airport primarily serves inland Castellón province's citrus-growing communities and coastal tourist towns, offering an alternative to the more congested airports at Valencia and Reus for travelers heading to this stretch of Spain's Mediterranean coast.