Peace Eagle 1 is modified and tested by Boeing Integrated Defense Systems in Seattle, Washington, USA. Peace Eagle 2, 3 and 4 are modified and tested at the facilities of TAI in Ankara, Turkey, with the participation of Boeing and a number of Turkish companies. As of 2006, the four Peace Eagle airplanes were scheduled to be delivered in 2008. As of mid-2007, systems integration was ongoing and airworthiness certification works continued. In September 2007, Boeing completed the first test flight of Turkey's AEW&C 737.