Originally Posted by MSPeconomist

OTOH AmEx has a lounge agreement with DL that all Plat and Centurion cardmembers can access the DL SC (at ORD and throughout the system) when the passenger has a same day flight operated and marketed by DL. Certain DL AmEx cardholders get the same privilege. Given this, I would expect ORD to be a low priority location for a Centurion lounge.