Four Turkish F-16s, two Block 40 and two Block 50 aircraft, are going through the flight test phase of the Peace Onyx III program at the Lockheed Martin facility in Fort Worth, Texas. The aircraft arrived in June 2009 after a successful ferry mission from Akinci AB located near Ankara, Turkey. The Turkish Air Force provided tanker support for the ferry flight. The F-16s received a complete avionics upgrade prior to the start of the test program at the Turkish Aerospace Industries facility, also located in Ankara. The flight test phase is expected to last through September 2011.