Moderator: United Airlines
Join Date: Jun 2007
Location: SFO
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DCA & IAD handle about the same total passengers and IAD has significant more long-haul international (higher revenue generating)
EWR has significantly more passenger traffic than LGA and UA has a reasonable non-hub share at LGA.
One can go around and around if DCA is better than IAD or EWR vs LGA / JFK because it comes down to where you are in those metro regions -- which is most convenient for your personal travel patterns.
For me coming from the west coast (non-stop), the answer is pretty clear for me. But it is different for others.