Originally Posted by
aztimm
Yes, unfortunately everyone from the BA flight gets funneled through CBP (if you have Global Entry just use a kiosk, then go to an agent), then you have to exit. You'll have to keep walking down past baggage claim for a bit, then take the escalators up to re-clear security. With GE and Clear, it shouldn't take you more than 15 minutes. There is a surprisingly amount of walking involved from the aircraft to the CBP / baggage claim area.
If you are flying BA in a premium cabin (business or F), you should get access to the AA lounge. But otherwise, you won't have lounge access. I'd recommend going to the outside viewing area (follow signs for the DL lounge, it is right next to it), and hang out there, maybe pick up something to eat/drink before heading out.
Thanks. I might just replace the AA AUS-PHX with a Southwest AUS-PHX cutting the connection time down to 2h (sounds that it is still plenty of time). If I remember the terminal is relatively small so Southwest and AA gates are all close to each other.