A federal investigation into the almost-collision between a Delta Air Lines flight and military jets near Reagan National Airport found that airport controllers didn't stop flights during the military flyover. 

The incident occurred March 28, and details of the investigation were reported Tuesday.

Sources told CNN air traffic controllers in the control tower of the Washington, D.C.-area airport didn't hold departing flights for five minutes like they were supposed to, as military jets were scheduled to do a flyover at 3:17 p.m.

A source told the news outlet that it is standard protocol to have a short pause in departures from the airport while military jets have a flyover from nearby Arlington National Cemetery, but that didn't happen. 

An analysis by CNN using information collected from a flight tracking website called FlightRadar24, suggests the military jets and the Delta flight were five seconds away from colliding with each other. 

This incident took place one day after an air traffic controller was charged with assault and battery in connection with a scuffle inside the control tower.