An American Airlines regional passenger jet was involved in a mid-air collision on Wednesday night with a U.S. Army Black Hawk helicopter near Reagan Washington National Airport, officials said.

National Transportation Safety Board Chairwoman Jennifer Hommendy described the investigation into the crash Wednesday night as an “all-hands-on-deck event” for the agency during a news conference Thursday in which she appeared with members of the board and a senior investigator overseeing the probe.

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

Everyone aboard a plane that collided with an Army helicopter near Washington, D.C., are feared dead, which would make it the deadliest U.S. air crash in nearly 24 years.

The accident that resulted in a commercial airplane crashing into the Potomac yesterday will require air safety investigators to dig deep

Here's what you need to know about the history of plane crashes in Mississippi. Here's what the NTSB says about where, when, why flight safety failed.

Greg Feith, former NTSB senior air safety investigator, joins Meet the Press NOW to discuss the tragic collision between a commercial airplane and Black Hawk helicopter in Washington D.C. and what the next steps are in investigating the accident.

Federal leaders are launching an investigation into the deadly plane crash that happened late Wednesday night in Washington, D.C. President Donald Trump says his administration is working to get answers and he's suggesting diversity policies may be to blame.