Find Wi-Fi passwords in the comments sections on Foursquare
If you're loitering outside a lounge in the hopes that the Wi-Fi signal reaches you, it's not gonna help if you don't know the password. Thankfully, generous folks on Foursquare have been known to post this password info in the comments section of a given lounge.
Like here. And here. Oh, here too. And... you get the idea.
Turn back the clock on your computer
When all else fails, sometimes simply changing the clock on your device will do the trick. If the airport offers free Wi-Fi for a limited period of time -- say, an hour -- then you can change the time on your computer or phone when the window is almost up. It's an incredibly easy trick that sometimes does work.
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Joe Oliveto is a writer for Thrillist and would probably empty his bank account for airport Wi-Fi. Follow him on Twitter.