Hi!
I have a question regarding access to the AA Flagship Lounge at ORD T3:
We have an Alaska Airlines flight to ORD followed by (RJ) Royal Jordanian's business class to AMM. As we may arrive at ORD T3 where the Flagship Lounge is located, I wonder if we can access the lounge given that our next flight is on Oneworld business class.

Since we may not have the boarding pass when we arrive at T3,
* would we be able to access the lounge showing our flight ticket?
* would we be able to check-in for RJ and then return to T3 (despite that RJ departs from T5)?

I will try to see if we can check-in online for a digital boarding pass.

Thank you!
P.S. this is my first time posting on flyertalk so please feel free to correct me if anything is unclear.