DCA-IAH-LIM-IAH-DCA round-trip.
Got to IAH and had mechanical on the IAH-LIM. Ended up being 5 hours late but I would have missed my connection to CUZ for a short trip there so I asked and UA sent me back to DCA and gave me a full refund.
Got miles DCA-IAH-DCA which was fair.
Paid business class ticket.