Live in base.

Lots of extra money to be made picking up OT on your down time when you live in base. Plus the retirements at AA will give you a great schedule in no time.

Definitely live in base. A Delta base.
There is absolutely no comparing these airlines at this time. Delta is far and away the premier US Airline. Read the financials. AA debt is staggering, and we are going into a recession most likely. Ask any AA pilot with seniority about how they bid some great trips, and get rescheduled almost every time.
35 yrs AA and have a nephew here as well. Delta.

Stats
 

Impressive What are your stats?

If you haven't figured out now, parenting sure teaches you quick. Life is about choices. Pick one thing OR another. May work, may fail. You'll never get to try (or know) what you didn't pick.

But with more time left at AA than you have been alive thus far ... You're gonna end up senior and your gonna get senior quick. And seniority is everything and living in base is key.

yeah, you may be on reserve for awhile - that's fine if you can sit reserve and change diapers. Move to Charlotte, put down roots, raise your family there and be around to see your family grow. Coach soccer, go to little gym classes, be at the kindergarten plan even when you're on reserve.

Where are you going to find a 1.5 year old?

(I mean, as long as we are asking useless questions)

It is good its not a third child, as I hear they are Chinese.

Delta guy here. Delta has been great and will be great for you too, but in your situation I think I would choose American. Sure Delta is better ran (for now), has less debt, and is a nice place to work. However, I think your seniority will be a lot better at AA and being able to live in base, if you can, increases QOL exponentially. There's always the chance that AA closes CLT eventually, but you run that risk anywhere. Both airlines will change drastically throughout your career, but seniority is constant and is a huge part of airline life (and being able to live in base while your kids are young will be great).

I’m at Delta and it’s a great place to work. But LIVE IN BASE. That cannot be over stated. Come here if you plan on living in a Delta base, go to American if you plan on living in an American base. I think the doom and gloom about AA debt is overblown. It’s not going anywhere. United, Delta and American are “too big to fail”. This isn’t the age of Braniff and Pan Am.

It's going to take several years to get CLT
There's a good chance he gets 737 LAX.
Seniority definitely going to go quickly up at AA.
But the way this place is run is extremely poor.
Tell us what your profit share was last year.