By Tim Hepher PRAGUE (Reuters) -Europe's Airbus broke a major commercial barrier on Tuesday when its A320 family of planes overtook the Boeing 737 to become the most-delivered jetliner in history. Boeing's decades-old record fell with the handover of an A320neo model overnight to Saudi carrier Flynas, bringing total deliveries to 12,260 since the A320 series entered service in 1988, according to benchmark data from UK-based aviation analytics firm Cirium. Airbus and Boeing did not immediately respond to requests for comment on the data, tracked by leading aircraft supply analyst Rob Morris. Demand for the industry's workhorse A320 and 737 jets has surged in recent years, as economic growth led by Asia brought tens of millions of new middle-class travellers into the skies. Together, Boeing

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