Thank you.

From what I understand, if lounge access is just by ticket, than you are supposed to go to the lounge of the international carrier(s) you are departing or arriving on?

I see that BA does not have lounges in DCA nor LGA.

Given that situation, then they would have access to another (most likely the "home" carrier) lounge. I got this from another thread about BA flights into Sydney have access to the Qantas lounge as they are the only one there.

Thanks,

Steve