Was doing a flight on the ramp at T5
today and saw a AA
757 just sitting on runway 31R right by delta alpha. There were a ton of emergency units but they didn't go up to the aircraft. Just hung out on taxi way alpha and bravo. Plane then started to move and they followed it. Just curious as to what the problem was. I ask the captain what was going on while I was pushing him out but he wasn't on ground yet.