1. Atlas-- Gets you heavy FAR 121 time and Intl experience and possible off the street hiring at a legacy or Fedex/UPS? I think they still offer home basing which is a big plus.
2. PSA- Flow to AA- If projections are correct, you will be at AA before age 50. Great travel benefits. Pay now 50K+ first year.
3. Compass- West Coast bases?
4. Republic- ???? Not sure.