I'm old enough to remember this happening 17 and a half years ago.
Two airplanes had crashed into the Twin Towers in New York, and word starting coming in of another plane crashing into the Pentagon building. Talk of terrorism spread, and American airspace was shut down, and another airplane crash was reported. All the news websites were down, except for Chips & Dips, which had disabled images and was mostly text anyway.
Actually, the site had already changed its name by then. I sometimes see some usernames here that I remember from there.