Newark Airport Suffers Another Radar Outage

The air traffic control mishap early Friday morning added to disruptions in recent days that have heightened concerns about safety at one of the busiest U.S. airports.

How Lost Radar and Silent Radios Have Upended Newark Air Travel

A technical outage in Philadelphia last week terrified air traffic controllers and stranded passengers. As the summer travel season looms, the F.A.A. is racing to address the problems.