It's gotta make economic sense. IMHO, even if mainline pilots were paid regional rates to fly them, the mainline cost structure is too high in comprison. I'm talking rampers (both number of, and pay), mechanics, FAs, cleaners, etc. I just can't fathom that these other groups would go along just to help out a bunch of, "whiny-a$$ed, overpaid pilots".
I personally think 99 seats will be the magic number.
I will give you the mechanics and the F/A's, although an agreement can be worked out where we use different F/A's for that part of the operation much like we do with our Guam base. The F/a's are on a completely different list with different contracts. The cleaners, and rampers are already contracted out for the most part already on the CAL side and I expect that will carry over to UAL. The same people that clean us and park us do so interchangeably. We would save money by eliminating the profit we pay your company to do the work.
The reason MGT. wants Express types is because of the power to control the groups with the whipsaw. They will not be happy until all of the flying is outsourced. 99 seats LOL, Why stop there?