Flight 5159 from Denver to Prescott on Saturday June 08th and Flight 5158 from Prescott to Denver for Sunday June 09th were canceled due to GPS tracking difficulties. All remaining flights for Sunday June 09th are scheduled to operate as normal. Please be advised that the City of Prescott has not imposed any local restrictions causing these cancellations and Prescott Regional Airport is open and operating. We do advise passengers to continue to monitor your flight status through the United app or online at www.united.com or by calling Reservations at 1-800-864-8331.