Why wait until 20/20 to start?
American Airlines owns three regional airlines. Guaranteed flow through to AA. It would take approx 8-12 years from zero to AA. You’d have 20-25 yrs at AA.
Start flying ASAP. Work in the degree online after you’re working as a pilot. It Wil take you 5-8 yrs to be competitive as a pilot and 3-6 yrs will be after your initial flight. You can use those 3-6 years to get your degree which will meet the college degree standard most airlines require. Fly first.