OPNLguy, are we talking about the same incident? The one I'm refering to happened less than a year ago (I'm pretty sure summer 99) and it was the daily DC10 ORD-BWI. I spot in DCA and BWI, and I see this flight often when I'm there in the early evening. It really resonated with me considering that I had seen this flight many times at BWI.
It was really neat reading a newsgroup article from a startled DCA flier that afternoon, and then hearing it on WJLA that night. Not often i get news from the newsgroup before the TV-news.
Anyways, the TV-news was consistent with my thoughts that the DC10 was inbound to BWI, rerouted to IAD, then rerouted to DCA. (I seem to remember a mention of Andrews, and how it wasn't available for some reason or another. Maybe the POTUS was there. )