Latest on Catastrophic American Airlines DC Plane Crash

A collision occurred between an American Airlines jet and a military helicopter near Reagan Airport in Washington, DC. The airport is closed, and rescue operations are underway in challenging conditions. The incident is the first commercial jetliner crash in the US since 2009. Emergency responders are working in frigid temperatures, and both aircraft are in the Potomac River. American Airlines and political figures, including President Trump, have responded, with investigations launched by the Army, Department of Defence, and FBI.

What did the American Airlines CEO express regarding the incident?

What has been stated about the investigation into the collision?