Technology and staffing problems have plagued the airport, one of the nation’s busiest hubs. Officials say they are trying to resolve the issues, but concerns remain.

According to the New York Post, a blackout on April 28 for air traffic controllers overseeing Newark led to many workers taking trauma leave, exacerbating its staff shortage. In addition, a Newark Airport runway is closed for “rehabilitation work” leaving the airport with only one functioning runway.

United Airlines executives are trying to reassure their customers it is safe to fly at Newark Liberty International Airport​, despite all the recent problems.