Most people can cross AA off their listing they don't work for a wholly owned. Flows take up a little over 50% of the new hires while the other 50%is made up of mostly military and family/higher up connections. Very few off the street hires that don't fit in the categories above are getting hired at AA.

I would put my order as;
1.Envoy (3 month upgrade)
2. PDT
3. PSA
4. Skywest
5. Endeavor

Again choose the one that gives you the best QOL, if you can live in base then that should be your first choice.