Singapore Airlines (SIA) has firmed up an order for 25 more widebody aircraft from Airbus, comprising five of the world’s most efficient, high capacity aircraft, the A380, and 20 A350-900s. The deal was completed in 2012 and follows an agreement in October 2012. Singapore Airlines has placed three consecutive orders for the A380, making it the second largest customer of the A380, and now has 19 aircraft in service. In the mid-size category, the new A350 XWB order sees the airline double its backlog for the all-new aircraft to 40. The A350-900s will be used by the airline on both medium and long haul routes.