I've been flying to MCO frequently for work via IAH. United has a very optimistic departure time for the afternoon flight. 1267 is supposed to depart at 2:34pm but the incoming flight, 1548, isn't scheduled to arrive until 2:05pm. Of course 1267 never departs on time. I've attached a couple of tiff files showing 1548 arriving 5 minutes early while 1267 is departing 26 minutes late due to late arrival of inbound aircraft.