Transportation Secretary Sean Duffy said the federal government had reduced the number of flights out of Newark Liberty International Airport after two major air traffic control

Communication problems, including a brief radar outage at the air traffic control facility Friday and an outage last month, have left travelers wondering how safe it is to fly into Newark.

Federal rules cover what passengers are due when flights are disrupted. If an airline cancels a flight, it must give a refund — even for non-refundable tickets — assuming the flier doesn’t want to accept alternative travel plans that may be offered, the U.S. Department of Transportation says on its website.