Given your timeline and stated desire for west coast widebody flying I wouldn’t even consider AAL. Something like 30-40% of UALs flying is widebody. American is mostly a domestic narrowbody airline with some seasonal widebody service to South America and Europe. The big 321XLR order gives a lot of insight into AA’s international strategy.

You have to be in the top 10% of the seniority list to hold west coast widebody Captain at AA. That’s not going to happen in 18 years. AAL is canceling a lot of pacific long haul while UAL has a steady stream of new route announcements.

The AAL contract is severely lacking (that might change soon) but considering the debt load it’s unlikely AAL will ever have an equal international footprint to UAL or DAL. They will most likely just farm it out to Joint Venture partners because it’s cheaper and easier.

If your goal was to be a 737 or A320 Captain or you wanted to live in Florida then I would say pick AA. Seniority progression will be faster at AA on the narrowbody domestic side.