Thought of day: what are some easily confused airports?

Once a year or so, some poor people make the news after mistakenly ending up in Sydney, Nova Scotia instead of Sydney, Australia, but I'm thinking of more pedestrian mistakes that could trip up even a not-entirely-clueless traveler, and preferably a bit more interesting than thinking your flight leaves from London-Heathrow instead of London-Gatwick. For example, DFW has flights to both Springfield, MO (SGF) and Springfield, IL (SPI), and there's a San Jose in both California (SJC) and Costa Rica (SJO). Any others?