Perhaps the best hack is not to get ripped off via onboard wifi.
The cost of inflight wifi can take your credit card account to a place you don’t want to know about.
Future.Travel in an eBlog talks about how to set up your phone/laptop so it is not eating $ by connecting to the internet when flying. They also look at how to not pay (get free wifi when flying) by accessing the free Google portal that is unadvertised for many inflight wifi systems. Even works with cheap airline tickets or if you are sitting up front in a discounted business class ticket. Future Travel Experiences @ Future.Travel