Follow the latest updates on the Washington plane crash on Metro’s live blog Potomac River – a 400-mile waterway flowing from ...

The Federal Aviation Administration announced on Wednesday it is taking steps to improve safety around DCA after deadly ...

The crash sent both aircraft plunging into the Potomac River ... were within one nautical mile of colliding with a helicopter and vertical separation was less than 400 feet, according to the ...

The warning signs leading up to the disaster over the Potomac River were there ... within one nautical mile of colliding, with a vertical separation of less than 400 feet. Additionally, there ...