Either:
Envoy - DFW (10 Flights a day on AA, one OAL)
or
Endeavor - JFK/LGA (Each have 5-6 flights a day on Delta, + other flights on Jetblue and AA)

This matters for commuting priority who you work for.. difference between getting on a flight or not.

Definitely wouldn't go to Republic right now, they are about to be in for big stagnation with the loss of airplanes, pilots bailing out and way too much bankruptcy uncertainty.