Honestly though, what does that have to do with the guy who has been there 5-10-15 years, and proven himself to be reliable, and competent enough? And if I'm good enough to fly your passengers on a "Connection" flight, I should be good enough to do it on a mainline flight. After all, I am representing the company who gives it's the flying.
That's a suitable rationalization, but you do realize that some carriers are bringing more and more "feed" back in-house and moving away from large-scale outsourcing in order to have more control of their product.
I'm not saying I don't agree with what you're saying, however I would heavily suggest doing what you have to do to work on your exit from the regional sector.
The pretty girls at the party love Johnny Football Hero. Even though Tad the Math Major is just as smart, just as athletic and a better conversationalist, maybe change parties or join the football team.