Updated my original post (post #9) with what I pulled from the Priority Pass app and recent FlyerTalker reports - it's been a while since I've flown Southwest and didn't notice that this thread was still active. Feel free to include any personal experiences and I'll update when I get the chance. I have updated with the Priority Pass Select level of access, and added placeholders for the Airspace lounges (SAN, CLE) and Centurion Lounges (LAS, LGA) that we can access with our Amex Platinums.