Carolina Panthers quarterback David Carr was downgraded to questionable for Sunday's game against Arizona after his sore back stiffened on the team's cross-country flight. Carr had been listed as probable after practicing Friday, but he experienced pain on the flight later that night. He was downgraded before the team's afternoon walk-through Saturday afternoon. Carr is expected to warm up Sunday morning to determine if he'll play. If he can't go, coach John Fox will have to decide between 43-year-old Vinny Testaverde or undrafted rookie Matt Moore.