We're just going to leave this right here.
Don't know if this is legal, but it exists. Computer engineer Anil Polat, writes Condé Nast Traveler, compiled a list of crowdsourced Wi-Fi passwords valid for access at airports around the world. His app, WiFox, can download them all to your phone so you'll have them when you need them.
As Traveler reports, it's a little stronger on airport Wi-Fi passwords outside of the United States right now, although users report this is improving rapidly. But for many airports, it's as specific as go to this café in this terminal and use this password, which gets you this much time in access.
The app, which went live in late September, costs US$2 and is available on both iOS and Android.
The security issues of hooking into these networks is your own concern. (Here are some tips on that.)