transonic wind tunnel Preliminary analysis of test data revealed “no major surprises or obvious problems”. An estimated 4,000 hours of wind-tunnel time will be logged in developing the P-8A. The Boeing-led industry team, which includes CFM International, Northrop Grumman, Raytheon, and Smiths Aerospace, will produce five test aircraft during the programme’s system development and demonstration (SDD) phase. The Navy plans to purchase up to 108 aircraft to replace its aging fleet of P-3 aircraft.