Prompted by a radar failure a week ago at Newark Liberty Airport, and a midair collision that killed 67 people in Washington D.C., President Donald Trump‘s administration announced an unprecedented program to rebuild the nation’s air traffic control system and recruit more air traffic controllers.

The air traffic system meltdown at Newark Liberty International Airport last week “was the most dangerous situation you could have,” according to an air traffic controller on duty that day, as the fallout from the outage stretches into a second week.