Bright Side of News reports five airline companies have already adopted Panasonic Aero's eXConnect System to offer broadband Internet on planes with 30Mbps download and 1.5Mbps upload capabilities. It should be available within three to four years.
At first, specifications are quite interesting: 30 Mbps downstream, 1.5 Mbps upstream, availability over the North Atlantic, Asia, South America, South Pacific and Africa. This service already have five undisclosed airliners - but we managed to learn that the companies in question are Emirates, Malaysia Airlines, Quantas, TAP Portugal and one "member X" coming from an airport one hour below Malaysia's Kuala Lumpur International Airport ;-)
Service will roll out above the Atlantic first, and we have a sneaky suspicion that Emirates Airbus A380-800 and Boeing 777-300ER will be the first planes to receive this innovative service. In roughly 2011-2013 timeframe, you should be able to have this service as a standard.