Moving air traffic controllers means retraining them on the quirks of a new facility, and the process can take years.

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.

Flights to Newark Liberty International Airport will be limited following weeks of disruptions caused by staffing shortages and equipment failure, according to the Federal Aviation Association. Flight experts have suggested that the airport only allow 28 planes an hour until runway construction is complete,