On Sunday I will be flying back from ORD (T3) on AA metal in business class. I'm also a silver card holder. My partner is flying on BA metal (from T5) one hour earlier, she is in WT and has no status.

Obviously, I would like us to be able to spend as much time together in a lounge as possible.

I believe there is a shuttle connection between the terminals so we can meet up airside, but would be good to know if:

1. Am I right that I can use either the BA lounge or the AA lounge?
2. Is one better than the other - i.e. which should we head for?
3. Will i be able to guest her in as she is also on OW flight, albeit not the same one as me?
4. If (3) is a bit dodgy which lounge is more likely to give success?

Many thanks in advance.