DCA: Inter-terminal bus between B and C?
I'm going to be on an Air Canada flight from DCA, which leaves from the B Pier. I'd like to use the UA RCC on the nearer C pier. Is there a bus that goes between these two piers? Or would I have to go through security twice to do this? I vaguely recall hearing of a bus that goes between the two C piers, but my recollection is pretty sketchy...