I know the A310 is the only widebody that can be flown into SNA. Supposedly, DL used to fly them to SNA when they had the Ex-Eastern (or maybe it was PanAm?) ones. But I still have no explanation as to why a FedEx one was at the terminal...

The charters are indeed UPS. Does anyone have any other information (or is there a website?) on these planes? I assume the seats are on a plane that slides in on the track. But what about overhead bins? I take it there are no windows? A lot of fake light in the cabin, then?