On August 6th, the Minneapolis Air Route Traffic Control Center lost radar and communications for around two hours.
The outage disrupted more than 1,100 flights across the center's 330,000 square mile, nine-state airspace sector.
Two days earlier, on August 4th, President Donald Trump departed the White House inside his Marine One military helicopter.
As Federal Aviation Administration (FAA) protocol requires, the pilots tried to contact Reagan National Airport to tell them to halt commercial traffic during the flight.
But the air traffic controllers never heard the transmission and cleared a different airplane for takeoff - which came clo … Read the full story at The Verge.