When it comes to almost any sort of “best of” list for worldwide air travel, U.S. airports are woefully underrepresented. Indianapolis is one of the few standouts. A new state-of-the-art terminal gives this American hub some sparkle. The free Wi-Fi helps its image, as do the plentiful shops that offer services as opposed to retail. Indy is small in terms of overall traffic compared to most of the other airports on this list, but after its recent upgrades, it is a likeable underdog.