" OneWorld Sapphire (AAdvantage Platinum) and Emerald (Executive Platinum) members get access to all OneWorld lounges when traveling internationally on the day of travel.
Two notes: (1) Mexico (excluding MEX), Canada, the Caribbean, the Bahamas and Bermuda don't count as "international" for this benefit"
This restriction only applies to AA Platinum / Executive Platinum members. It does not apply to people with Sapphire/Emerald status on any of the other One World carriers. As a QF Platinum, I get access to the Flagship Lounge ( or Admirals club where not available) even if travelling economy on , say, ORD-STL, plus also receive drinks vouchers.
Dave