Originally Posted by
esc2476
I don’t see how unless they run an airside shuttle.
For that reason and (primarily) others reasons, I foresee this DCA lounge being landside -- sort of like at LGA. I doubt Amex is willing and able to operate an airside transit shuttle at DCA. Even MWAA and DCA-serving airilnes haven't been all that eager to have a bunch of airside shuttle vans in operation, and that's even as they could borrow from the playbook of ARN, where there is an on-call airside shuttle bus going among all its terminals.
Capitol One's lounge at IAD is to be airside. But that's IAD, with IAD having a lot more space airside that can be cheaply reconfigured to rent out than is the case for DCA.