The five day long Dubai Air show begins on Sunday showcasing world's most advanced flying machines. <br/> <br/>73 delegations from 40 countries, with the Middle East and North Africa accounting for more than a third are expected to visit the show. <br/> <br/>The Air show is being seen as a possible sign of economic recovery within the aviation industry with the participation of 890 exhibitors from 47 countries and organisers are hoping the event will deliver a confidence boost to the sector.<br/>