Surfing the Internet from the friendly skies is becoming a reality for more and more U.S. travelers. American Airlines is taking its experiment with in-flight Wi-Fi out of the trial stage and will be installing Gogo Inflight Internet on more than 300 domestic aircraft over the next two years. More specifically, American will install the Aircell system on its domestic MD-80 and Boeing 737-800 aircraft fleets, starting with 150 MD-80 aircraft this year. In December, Delta said it would offer Gogo Inflight