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

One runway is closed and there's a shortage of air-traffic controllers, causing flights to be delayed or canceled.

Last Monday’s radar and radio outage at one of the country’s busiest airports has brought a deep-rooted bramble of debilitating problems to light. In the constant hustle and bustle of one of the busiest airports in the United States,