Found the answer.... finally. MODS please close thread
Getting from Pier to Pier
There are no airside walkways between the terminals, nor is it possible to walk between piers in the B/C terminal building. To facilitate connecting flights between the North and Center piers, US operates a shuttle bus service located between gates 36 & 38 in the North Pier and gates 23 & 25 on the Center pier. *Special assistance passengers unable to manage stairs to the shuttle buses can use a wheelchair porter to be escorted from pier to pier (re-clearing security).
Connections from US or UA to CO or AC require exiting security. From the time one exits security at the North pier to the time one arrives at security for Terminal A should be no more than a brisk 12 min. walk.