The head of the Federal Aviation Administration has told Congress that the agency must do more to ensure flying remains safe after a midair collision over Washington, D.C., that killed 67 people.

Four jets came close enough to the Delta flight, which was taking off from Washington’s Reagan National Airport, to set off a collision-avoidance alert.

The Delta aircraft received an “onboard alert” that another aircraft was nearby, and air traffic controllers issued corrective instructions to both aircraft, according to the FAA.

A Minneapolis-bound Delta flight leaving Reagan International airport in Washington D.C. had a near miss with an Air Force jet Friday afternoon.

A Delta Air Lines flight narrowly avoided a collision with a U.S. military jet shortly after takeoff from Washington National Airport on Friday.

A Delta passenger plane and an Air Force jet flew narrowly close to one another outside Washington, D.C., on Friday, prompting a collision warning and "corrective instructions" from air traffic controllers.