Newark has had disruptions since April 28, when controllers lost contact and couldn't guide planes for upwards of 30 seconds.

When the agency approved moving Newark air traffic controllers to Philadelphia, it said the odds of a dangerous communications breakdown was about 1 in 11 million.

The outage occurred at 3:55 a.m. ET Friday morning and lasted for about 90 seconds, the FAA said. A 90-second radar outage at the Newark, N.J., airport in late April caused hours