Originally Posted by sailingdane

The question is: let's say I fly on a one world airline such as LAN or Iberia. And I put my Iberia Plus number on the booking so that I will get points in my Iberia loyalty program from the flight. Can I then still get lounge access because I have the AAdvantage platinum (sapphire) card and I am flying with a oneworld partner?

Or to be more exact, do I need to have the AAdvantage number on the boarding pass or is it OK that there is another loyalty program on the boarding pass? As long as the flight is with a oneworld partner and I have sapphire status with any oneworld partner that is enough?