But even before the National Transportation Safety Board completes its investigation—a neurotically thorough process that will probably take about a year, and thus meshes poorly with the news cycle and the conspiracy-theorist cycle—it is easy to see some of the lines of inquiry that crash detectives will pursue.

Washington, D.C. Fire and EMS Chief John Donnelly said officials are confident all will be found. Divers are working diligently to locate remains as crews prepare to lift wreckage from the chilly Potomac River as early as Monday morning,

People walked along the Potomac River near DCA, close to where an American Airlines jet and a Black Hawk helicopter collided Wednesday, killing 67.