Let me do some rough, approximated math.

Average FO in a regional makes about 40k/yr, average CA makes 80k, so per crew mainline airlines are paying ABOUT 120/yr per crew. Just a quick glance over at the mainline scales, even for CRJ/ERJ 76 seat airplanes FO's are making 80k and captains with some seniority at least 120k and higher, so right now mainline is saving ~80k/year/crew, and that doesn't even factor in higher mainline retirement contributions and profit sharing, so I'd venture that it's over 100k cheaper to still outsource to regionals.

That 100k leaves a whole lot of room to improve our pay. Delta is already giving 40k/year/crew to Endeavor and they're still making money off them. In my estimation accepting any offer less than that is selling a pilot group short, and AA can definitely afford to do that with ease.