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First of all, you probably want to make sure the flight you have offers in-flight WiFi. Not all carriers do, and many of those that do don’t offer it on every flight. The quality of service is a bigger issue that theoretical speed, and that has been a problem when I’ve used it in the past. Maybe it’s better now, but based on my experience from a year or two ago, be ready for inconsistent connections and speeds. Depending on the plane and WiFi provider, you could see anything from 432Kbps to 50Mbps...in theory. The market is dominated by Gogo at the moment, but AT&T has announced that they are entering the in-flight WiFi business.