Originally Posted by
unityofsaints
I've got a similar question which has been bugging me for a while: can someone on CO *G but not actually leaving on a CO flight use the Skyteam lounge? I've got a 4-hour layover before leaving on UA931 and want to do some serious lounge-hopping

Nope. You won't have physical access (UA isn't in T4) nor would you be permitted in with the credentials you presented.