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

The airport, which serves as a critical transportation hub for the New York metropolitan area, has seen more than 1,400 flights delayed or canceled during the seven-day crisis. On the worst days, over 40% of flights were delayed and 20% canceled entirely, creating ripple effects throughout the U.S. air transportation network.

The Federal Aviation Administration is meeting with airlines Wednesday on ways to reduce over-scheduling and flight delays during peak hours at Newark Liberty International Airport.