An American Airlines jet and an Army helicopter collided over Washington, D.C., Wednesday night. All 67 people aboard the aircraft are presumed dead.

In the first 24 hours, we usually know very little, and often what we think we know turns out to be false in the days and weeks to follow,” William J. McGee, senior fellow for aviation and travel at the American Economic Liberties Project,

A timeline of the D.C. plane crash on Jan. 29 details the moments before and after an American Airlines passenger flight and Army helicopter collided over the Potomac.