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

The midair collision at Reagan National Airport on Wednesday night has presented Sean Duffy with a major crisis just hours after he was sworn in as secretary of transportation.

Sixty-seven people died in a collision between a Bombardier CRJ700 regional jet operated by PSA Airlines and a military Black Hawk helicopter.

The National Transportation Safety Board is an independent federal agency tasked with examining serious transport-related accidents.

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

Dozens are believed to be dead after a regional American Airlines flight, operated by PSA Airlines, collided with an Army helicopter in midair on Wednesday night when it was about to land at the Ronald Reagan Washington National Airport.

Sixty-seven people died in a collision between a Bombardier CRJ700 regional jet operated by PSA Airlines and a military Black Hawk helicopter.

An Army Black Hawk helicopter collided with a regional jet near Ronald Reagan Washington National Airport on Wednesday evening, U.S. officials confirmed to ABC News.

An American Airlines commercial flight and an Army Black Hawk chopper crashed midair on Jan. 29. Here are updates on this developing story.

American Airlines Flight 5342 from Wichita, Kansas, was attempting to land when the plane and a Black Hawk helicopter collided.

Video footage of the incident shows the aircraft flying at a low altitude, before an explosion happened at the moment of impact. The National Transportation Safety Board is investigating.

Sullenberger said once the NTSB releases the probable cause and contributing factors there would likely be changes. Here's his reaction to the D.C. aircraft collision.