The West side of the company is happy to take damn near anybody..and I mean that with no disrespect to the East guys, I don't know what their deal is. I'm not a Captain, but as far as I'm concerned, if you're a wholly owned, they you're family and we'll treat you as such. Everybody else we'll treat like welcome guest.
I did have one of our guys tell me they hauled a Mesa Dash FO from Florida to Denver. As luck would have it, turns out the AWA FO was finishing his trip and was going to be riding on the Mesa FO's first leg to get home. Guy says, "hey, I have a lot of trouble on your flights. Your guys don't seem to try very hard to get Jump Seaters on." Mesa guy says, "yeah, a lot of our Captains aren't real big on OAL guys sitting up front. I think the guy I'm paired with doesn't like main-line guys up front". Sure enough, our FO gets the thumbs down, "Sorry, Captain says won't work 'cause of W&B."
If we don't look out for each other, who will?