Originally Posted by
guv1976
In NYC, Delta will be for the transfer JFK <==> LGA on inter-continental itineraries. Bags must be carried by the passenger.
I actually did that once, a long time ago.
OP seemed to be implying arrival at one airport [spend time in DC area] and a departure from the other, rather than as part of int'l itinerary. But, hey, what do I know.