I have Star Alliance gold status (with Aegean). For the next two weeks I'm travelling from London around Canada and the US with my girlfriend. We'll be flying in economy on Air Canada and United.

I'm aware we can both use the lounge when we fly on Air Canada, United, etc (with her as my guest) but do guest privileges extend to other benefits - specifically priority security and priority boarding? Clearly I'm not going to use these benefits if she can't too!

For reference we'll be flying through LHR, YOW, ORD, SEA, SFO, EWR - in case that impacts security line policy.

Thanks in advance for any help.

John