DCA Lounge Question
 

I couldn't find an appropriate thread for this question, but I was wondering whether getting nonflyer access to the DCA United Club/terminal would permit access into any U.S. Airways terminals.

Once through security, you can go anywhere airside, IF the USAir terminals are walkable airside from the UA terminal, then no problem. Check a DCA map.

No. United is in a separate wing that is not connected to the two piers that house AA/US. There are no airside shuttle connections either since the airlines operating in pier A (UA, DL, and AS) do not have operations in the other piers.

You would have to get the non-flyer through security in the middle piers which would likely require a ticket on AA/US, B6, or Virgin.

OP, you can also try asking for a Gate Pass at the appropriate terminal, e.g. if you need to meet an incoming flight to help a passenger.