My wife an I have four multi-leg trips coming up and since we will most likely be in coach I wanted to see which exit rows have movable center armrests. I know most if not all "front/bulkhead" exits don't I'm wondering about mid plane exits. I did some searches but didn't really find a link. I know info on seatguru is sometime questionable so I thought I would post the inquiry here. Most of the planes will be MD-90 and 75x.