An air traffic controller at Reagan National Airport reportedly left early on Wednesday before the deadly collision between an American Airlines flight and a military helicopter.

The NTSB is investigating "thousands of data points" to find the cause of the fatal D.C. plane-helicopter crash, including whether air traffic control staff was short personnel.

The National Transportation Safety Board has interviewed the air-traffic controller who was working at the time of the midair collision, board member Todd Inman said, adding that the interviews have been ongoing throughout the day.

The tragic, midair collision in Washington, D.C. is putting a spotlight on air traffic controller shortages. It's a nationwide problem, but the area around NYC is especially hard hit.

Donald Trump claimed, without citing evidence, that DEI initiatives at the FAA were partly to blame for the tragic plane and helicopter collision in D.C.

A single controller was left to handle the air traffic of planes and helicopters flying over the airspace when two people would typically be monitoring both flight paths

As investigators look into the cause of Wednesday night's plane crash, pilots share their initial take on the collision.

Below are the names of the victims that we know so far. Click on each square to learn more about those killed. This article will be updated as new information becomes available. Viewing in the app? Click here to learn more about those who were onboard.