Originally Posted by
Hardcharger
One that often gets overlooked is travel privileges if you're a commuter. American is based on time of check in, Delta is seniority based, so that could make a huge difference on your quality of life.
DAL is seniority, but once you've booked the JS, it's yours. I can't remember the timeline since I don't commute and rarely JS, but pilots going to work get to book the JS a few days before booking a JS home from work. In turn, pilots going home from work get to book a few days before anyone booking the JS for personal travel.