It was expected to begin at 4 p.m. but has since then been rescheduled for 5:30 p.m. Once it begins, a streaming of the presser will be added to this story.

The National Transportation Safety Board says it has recovered two black boxes that will help provide investigators with answers as to what caused a deadly collision near Washington D.C.'s Reagan National Airport.

Black boxes recovered after a jet and Army helicopter collided near DC; 14 still missing as NTSB investigates the deadly crash. Follow Newsweek's live blog.

The deadly crash in the Potomac after an American Eagle jet collided with a military helicopter has stirred memories of a long-ago tragedy in Washington, D.C. An Air Florida flight taking off en route to Fort Lauderdale crashed into a bridge and tumbled into the icy Potomac in January 1982.

Just a day before a deadly midair collision at Reagan National Airport outside Washington, D.C., employees at the Federal Aviation Administration were sent an offer to resign with eight months’

The 1982 crash happened moments after takeoff in icy conditions in roughly the same place as Wednesday's collision between a jet and Army helicopter.

One of the pilots of the passenger jet involved in a mid-air collision in Washington, D.C. was a native of New York but grew up in Florida, where he learned to fly planes, according to records and statements from those who knew him.

The midair collision over the Potomac River on Wednesday brings back chilling memories of another tragedy in the same waters more than four decades ago—when Air Florida Flight 90, bound for Fort Lauderdale-Hollywood International Airport,

CBS News confirmed only one air traffic control worker was managing the helicopters when the crash between a military helicopter and passenger plane occurred in Washington D.C. That is a job normally done by two people.

A midair collision over the Potomac River near Reagan National Airport recalls the 1982 Air Florida Flight 90 disaster.

National Transportation Safety Board Chair Jennifer Homendy said Thursday at a press conference that “we look at facts on our investigation and that will take some time.”

Investigators are seeking clues into this week's deadly midair collision, the deadliest aviation disaster in the U.S. almost a quarter century.