On November 19, the FAA’s computerized system for loading flight plans failed, causing widespread traffic delays of up to 90 minutes and some airline flight cancellations. Between approximately 5:15 a.m. and 5:30 a.m. EST the Nadin (national airspace data interchange network) system failed at both its Atlanta and Salt Lake City locations due to a router problem. The failure meant that FAA automated systems at major regional facilities temporarily could not process flight information, causing delays as ATC personnel were forced to input information manually. The Nadin failure stalled the process for entering Notams and weather information into the system. The system was restored by 9 a.m. EST, but cascading flight delays continued throughout the day.