The WiFi Network “mobilcom-debitel Free WLAN” at Hamburg Airport allows you to go online for 1 hour for free within 24 hours. If this isn’t enough, because you have longer waiting times at the airport, or you want to connect twice within 24 hours, simply change your WiFi-Card’s MAC-address after the hourly period expired.
To do this with Mac OS X there’s a simple tutorial here: http://osxdaily.com/2012/03/01/change-mac-address-os-x/
As soon as you have set a new MAC-address, reenable WiFi, connect to the Debitel network – and enjoy another 1 hour of free Intenet access! 🙂
By the way: you can use fake credentials for the signup on the WLAN access page!
…and I believe you posted this from Hamburg Airport?