Okay, well, almost nobody cares. So here it is.
Here's my favorite integration strategy when it comes to regional airlines and mainline carriers:
In the interest of background, I had a "guaranteed" job at 'merican once. Guaranteed is in quotes, because I didn't have a seniority number at American Airlines, merely an Eagle number and the 'opportunity' to, someday, in seniority order, move over there. I gave it up. I figured I could have less gray hair and still have a better job, than waiting for the 3,100 pilots on the list ahead of me to do their thing and flow. I additionally believe that no amount of
future possible jobs at what may be an entirely different company is worth bargaining away existing pay and protections for, unless you're just going to take my airline's list and staple it to the bottom of another airline's list. That's the sort of 'streamlined selection' and flow I can get behind.
Assume myself and Person X are on the same seniority list at (choose your Eagle or DCI carrier here). Person X's DOH being chronologically earlier than mine is perhaps the dumbest reason for Person X to be given an opportunity to work for Airline Y before I do, in what is a nominally meritocratic selection process. If their experience, resume, education, records are better then sure. If the only thing that differentiates me from Person X their DOH then I'm not sure what, exactly, the point was of even having the second carrier at all.
Now let's further assume that you are are a negotiator, on behalf of (choose union here) and you are offered an SSP or flow agreement or (whatever item) in exchange for the evisceration of already mediocre pay rates, work rules, and quality of life. I personally would prefer to have my money now, and make my own road, rather than wait for a job that is not necessarily
fait accompli. When the music stops, as so surely it will someday, I would prefer to have a solid job to rely upon until the numbers are in a better mood, rather than having bargained away things that I might need for purposes of keeping a roof over my head.
In short: Flow agreements and streamlined selection rub me the wrong way, because in my opinion, the trade that is made for them further devalue an already undervalued job.