Despite an order backlog covering 5,000 aircraft, turbine business aircraft manufacturers are expected to experience the steepest decline in production of any aerospace sector, according to figures revealed by management consultancy AeroStrategy at an aerospace materials conference in Pittsburgh last month. These manufacturers have already announced 20- to 30-percent production cutbacks this year, but AeroStrategy partner Kevin Michaels said this could yet grow to 40 percent. He predicts that annual business aircraft deliveries will decline to about 1,300 aircraft by 2012, eventually reaching 2,000 aircraft per year by 2019.