Sioux City!
It turned out that one of the passengers on board flight 232 was Dennis Fitch, a United training and check pilot with over 3,000 hours on the DC-10. Haynes asked Fitch to go back and look out the windows to check for any structural damage. When Fitch returned to the flight deck, he informed Haynes that the both of the inboard ailerons were sticking up, but none of the controls appeared to be damaged or moving.
Haynes asked Fitch to take control of the throttle levers to allow the crew time to sort out the other decisions they were facing. Fitch knelt down in front of the controls and began to work with the throttles to maintain control of the aircraft. During this time, the aircraft had completed two slow right turns while descending. Calling Sioux City approach, Haynes requested the ILS (Instrument Landing System) frequency for runway 31 (9,000ft).
AirDisaster.Com: Special Report: United Airlines Flight 232