I hate how most airports do not offer free wifi. You usually find a boingo hotspot around instead. So how can you get around Boingo?
Simple. Boingo is offering free wifi to iPhone users. If you have firefox, install an addon called User Agent Switcher and mask your browser to look like an iPhone.
Just create a new user agent.
User Agent: Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en)
App Name: AppleWebKit/420 + (KHTML, like Gecko)
Platform: Mobile/1A542a Safari/419.3
or Google iPhone UAS settings and the internet will be at your fingertips.
EDIT: If you use IE then install IE7Pro 2.4 for the User Agent Switcher