On May 9, 2008, at Yuma Proving Ground in Arizona, the A160T demonstrated its ability to hover out of ground effect (HOGE) at 15,000 feet to meet its DARPA milestone. It then surpassed the milestone during the same flight by repeating the HOGE at 20,000 feet altitude. A week later, starting the night of May 14, the A160T demonstrated its un-refueled endurance capabilities with an 18.7-hour flight, landing with over 90 minutes of fuel still on board. This was recognized as the longest un-refueled flight of any rotorcraft, and the Fédération Aéronautique Internationale (FAI) awarded Boeing the official endurance record in the 500 kg to 2,500 kg autonomously controlled UAV class for the flight.