A couple of things to add

- you often find there is a large queue outside the lounge with a separate person taking names - this is the Priority Pass Queue when they are full arranging call backs. Do your best DYKWIA impression, and head straight into the desk as they reserve capacity for anyone entering based on airline ticket / status. No need to queue in the priority pass queue.

- the lounge is ok, especially if you arrive on the earlier side and get some reasonable seats - there is only ‘snack’ food (think dips, soup etc). If you’re looking to eat dinner before boarding the BA flight, you’ll need to find somewhere in the terminal.

Enjoy Atlanta - I was surprised how much I liked the city (once you got out of downtown).