I'm not sure about this one....
Shuttle couldn't operate the E-jets for Frontier out of DEN because of UALs competition clause - that's why Republic do it. Not, as many think, because Shuttle is scoped by # of seats......
I think SkyWest could certainly operate both out of LAX, but UAL might have something to say about it.
UAL did have something to say about it...its true. They released SkyWest when the made that announcement to replace 20ish EMB120's with the CRJ over the next few year.
It seems as though they will move the DL 900's from ATL to LAX with a base in the next few years. Isn't express-jets contract for 2 years?