<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Guy Betsy:
In my experience, as a plain AA EXP without AAdmirals Club membership, you are not entitled to use the Flagship lounge if you are not travelling on the next flight in International premium class with them. Coming in on BA does not count. Yes, you would need an Oneworld Emerald card from another partner in order to access the Flagship lounge if you are flying domestic.</font>
When lounges in the US have been trying to not let me in with a platinum Qantas card (Emerald), the mantra that they spiel is that you have to have to be connecting to or from an international flight. Given that all Emeralds other than AA ones are entitled regardless, I have assumed that this was the AA rule and so the person should have been entitled to access when connecting in from an international flight with BA in the same way that a domestic F ticket allows access when it is part of a business/first international journey that day.
The wording on the AA website does also lend itself towards this interpretation where it says "access on the day of travel to the airline lounges of all the oneworld alliance carriers when traveling internationally (excluding Canada, Mexico and the Caribbean)". A domestic portion of an international journey would fit this wording quite aptly
Dave