Originally Posted by
latitude
I got turned away from the AA lounge in ATL the other day. I had (wrongly) assumed as a GCH and
not on a OW flight I was able to use the lounge. The lovely lady was very apologetic and explained I had to be on a OW flight as well.
No harm done, as I found a bar instead

The Open Doors policy for BA GCH is for BA lounges only.