Originally Posted by tmiw

Thinking about this some more, are there any airports that actually prevent you from accessing the free WiFi again once you've used it? I know SAN has a 30 minute limit but that just means that you have to go through the portal again and watch an ad to re-enable. A bit annoying but if you're not doing anything critical it should be no big deal (and if you are, you'd likely pay for the WiFi or use a personal hotspot).