This may be a stupid question, I did try to do a search.

I am star silver on US Airways, but I'm switching to United so I'm using my mileage plus number on my reservation. As I have zero status on United at the moment, my boarding pass says zone 4 on it. Can I still board with zone 1 if I flash my US Airways silver card? Just hoping to be able to get my carry-on in the overhead bin...

Thanks.