The FAA is holding a “delay reduction” meeting Wednesday, seeking to cap the total number of flights at the airport.

Several equipment outages over the past two weeks at the Philadelphia-based air traffic control center that guides planes to and from Newark Liberty International Airport have raised concerns about how safe it is to fly at one of the nation’s busiest airports.

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