If you got card and have any expired miles reinstate them for free.
I told them I understood this applied to all expired miles even though I haven't flown US since 2001. Got this in response (and 25K expired miles):
Thank you for contacting US Airways.
Miles are permanently deleted after 36 months of inactivity, and our
records indicate your last activity was 2001. However, due to the
misinformation you received, we have granted a one-time exception and
reinstated your purged miles. Please be advised no further exceptions
will be made.
No further exceptions for me, but for you...