When I started flying for a regional carrier in 1995, I made 15k a year. It was, therefore, a "hobby" and I worked a second job as well.
But it was okay, because I could expect to upgrade in 2-3 years to a decent salary when I made captain.
Then had a decent chance to get on with a major carrier within 5-10 years. A few more years there and I'd be making well into the 6 figures. I could retire at 60 a rich man with a six figure pension.
I have absolutely no idea why anybody would joining the U.S. airline business right now.
Which is the end goal, I believe, of all U.S. carriers: "We just can't find enough Americans to fill these jobs....."