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.

NBC News is live with a special report as the National Transportation Safety Board holds another briefing on the D.C. plane crash.

Fatal crashes of commercial aircraft in the U.S. have become a rarity. The last was in 2009 near Buffalo, New York.

Fatal crashes like the one that happened near Washington on Wednesday are increasingly rare because of modern aviation safety procedures.

Continental Airlines Flight 3407 crashed into a house in Clarence Center, killing everyone on board the plane.

An American Airlines jet with 60 passengers and four crew members aboard collided Wednesday with an Army helicopter while coming in for a landing at Ronald Reagan National Airport near

An American Airlines jet with 60 passengers and four crew members aboard collided Wednesday with an Army helicopter while landing at Ronald Reagan National Airport near Washington, prompting a

Air crash investigations can take months, and federal investigators told reporters they would not speculate on the cause.

An Army Black Hawk helicopter collided midair with an American Airlines flight from Wichita, Kansas, at Reagan National Airport on Wednesday.

Authorities have switched to a recovery mission in the Potomac River following a midair collision between an American Eagle flight and an Army Black Hawk helicopter near Reagan National Airport in Washington,

A jet with 60 passengers and four crew members aboard collided Wednesday with an Army helicopter while landing at Ronald Reagan National Airport near Washington, prompting a large search-and-rescue

A few minutes before landing, air traffic controllers asked the arriving commercial jet if it could land on the shorter Runway 33 at Reagan National, and the pilots said they were able. Controllers then cleared the plane to land on Runway 33. Flight tracking sites showed the plane adjust its approach to the new runway.