I think so. There are plenty of aircraft on the UA. So that wouldn't be a problem.
Fuel is creeping back up. That would probably be your biggest concern. Just find a good, free airport and you should be ok.
Remember not to complete with anyone when you first start out. Go ninja and choose a fleet type that can serve a range of routes. Focus on expanding flight ops with one fleet type and flying routes that are empty.
That's all there really is too it. Good Luck!