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Almost all major airports offer WiFi of some kind, although you might have to pay for access to faster or longer-lasting connections. Look up what access is offered at your airport beforehand so you know what to expect at the terminal. Bring work or study materials to make good use of your free time. Set up shop in a food court if you want to work on a table, or find a gate that’s not in use for a quieter spot to concentrate. Some airports offer small fitness centers, and airports in San Francisco and Dallas/Fort Worth even have yoga rooms.  If a gym isn’t available, do a few simple exercises like pushups, jumping jacks, or squats for a quick pre-flight workout in the terminal.  Make sure your airport gym also has a shower before you start working up a sweat. Most airports will have at least a couple small gift shops, and the bigger ones boast huge malls. Buy last-minute gifts or treat yourself to some new clothes or a book, but make sure your purchases can fit in your carry-on luggage, or ask if the store can ship them to you. Keep an eye out for duty-free shops in international terminals.
Hook up to the WiFi. Work remotely. Get some exercise. Shop in the terminal.