1500 over 5 years at AA, let's assume that's the norm. 300 per year at UAL, DAL, AA so were looking at 900 a year. If you don't have strong connections, internship, etc. you're not getting hired. Time to face the facts, most of us will spend the majority of our careers at a regional and maybe if we're lucky we'll spend the last 10 or so at a mainline.

These "projections" also account for growth which may or may not happen. I prefer to count my chickens after they've hatched.