The main difference is the amount of flying. Additional LAX and SFO flying, caused by the parking of UAL’s 73’s, shouldn’t be enough to warrant the cost associated with bringing in a new codeshare.

Now………what are you talking about? Mesa’s contract for 380+ daily UAX departures being canceled or the parking of UAL’s 73’s and the additional flying that might create out east. If you’re talking about Mesa’s flying then they could just spread it out amongst everyone although I would expect it to go out for bid, if and when UAL finally gives JO and Co the boot. But, if you’re talking about the 73 flying out east then I’m sure the same will happen in IAD and ORD (with all UAX carriers) as will happen with SKW in LAX and SFO.