Originally Posted by Kacee

The mx issues are exacerbated by the fact that UA's widebody fleet is stretched to the limit. So when an aircraft goes mx, there are no spares, and you get a cancel. This then causes ripples throughout the system. A far cry from the days when an mx at SFO meant you waited an hour while they brought a spare aircraft to the gate . . . .

Nor does it help that UA is operating two completely separate fleets, so god forbid if an sUA aircraft goes mx at an sCO hub (or vice versa).