Rolls-Royce Trent XWB engines, the most efficient flying in the world today, have powered the Airbus A350 XWB aircraft to the skies for the first time this morning in Toulouse, France. The Trent XWB is Rolls-Royce’s newest large engine and the fastest selling Trent engine ever, with more than 1,300 sold a year before the aircraft enters passenger service. Rolls-Royce started the Trent XWB programme in 2006…