Had a change of equipment at DFW a couple of weeks ago. Had to bring a different plane in for a flight from DFW to TUL that had been sitting somewhere at DFW that had an interior temperature as we boarded (according to the pilot on an announcement) of approximately 100 degrees. Obviously all shades were closed and a/c was blowing hard. I don't think it ever got below 90 on our short flight to TUL. I usually am cold on all flights but not that one.