We can non-rev using myidtravel website. Need to do an online test every six months so you know the rules. Southwest is about $30 each way and the easiest to go on. Delta fee is based on a bunch of factors. SAN-SLC $80 each way. Flights are over sold a lot. If you can travel off peak you will have better luck getting on.
Flown with some guys who have gone all over the world. They homeschool so they can miss the rush.