Yesterday left Buffalo after a 2 hour delay.  Arrived in Chicago.  Upon touchdown the flight crew experienced the same problem with the plane that had caused the initial 2 hour delay.  This problem, the nose gear.  The crew could not steer the plane so could not get to the gate.  Sat on the tarmac about an hour.  Finally towed into the hanger.  We missed our flight to Erbil.  We are now at a hotel in Chicago.  We are on standby for a flight this evening, but also have confirmed reservations for July 4th.  Praise the Lord, He will continue to lead and guide us in His path.