AMEX lounges access in SAO
AMEX has a Centurion Lounge in SAO outside the sterile area, which is a major drawback since the security check and migration line could take anywhere from 1 to 90 minutes depending on the time of the day.
On the other side they have a full set of beverages, sandwitchs, some hot food and fixed internet access from three PC (no wifi, but you can manage to use their eth cables).
I've been able to enter the AMEX lounge without showing any ticket.
INSIDE the sterile area, there's a Delta lounge. You do not need to be flying DL to enter. I entered twice by only showing my Platinum AMEX, while flying JJ and AR.
There's also a UA lounge that accepts Priority Pass cards, however they have limited hours of operation.
Have a safe flight!
LR@home