The failure was the second such incident in the past two weeks, amid continuing concerns over safety at the airport.

The air traffic controllers directing planes into the Newark, New Jersey, airport lost their radar Friday morning for the second time in two weeks.

Travelers flying in and out of New Jersey's Newark Liberty International Airport were increasingly edgy about a host of recent problems at the busy airport, but they were most alarmed about two separate equipment outages in the last two weeks that disrupted communications between air traffic controllers and pilots.