The trains that move passengers between terminals and the gates stopped working earlier this morning around 7:00am which caused very long delays for thousands of passengers.
Airport operators were able to get four of the five to work eventually, but the back up forced many to miss their flights. Officials believe the computers that control the trains stopped working.
The lines to get through TSA security was running about 1 and a half hours.
Airport officials eventually put busses on stand-by.