PRAGUE (Reuters) -Executives from Boeing and Airbus dampened speculation of imminent decisions to replace their best-selling narrowbody models, telling a major audience of investors that it would take time to achieve the required jump in performance. The Wall Street Journal reported last week that Boeing was in the early stages of developing a 737 successor. But marketing chief Darren Hulst told the International Society of Transport Aircraft Trading that a launch is "some way off" while a senior Airbus executive said it would "take a bit of time" to achieve the 25-30% efficiency gain needed to attract the market. Both executives were speaking in response to questions on stage during an ISTAT gathering in Prague. (Reporting by Tim Hepher; Editing by Emelia Sithole-Matarise)
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