Update 5:30 P ET
We were advised that the United Airlines systemwide outage ended at approximately 5:20p ET, so the total duration was approximately two hours. There will likely be issues and cascading delays through the evening.
United Airlines has been experiencing a systemwide outage of their passenger service system (PSS), SHARES, since at least 3:20p ET. This system is used for reservations, ticketing, check-ins, etc. It is not operationally involved with safety of aircraft, but is critical for checking in and, in some cases, boarding passengers. It is expected to have a significant impact on United's airline this evening as flights will be delayed substantially because passengers will be unable to checkin for their flights as well as the other operational roles of SHARES.
The SHARES system is from Continental Airlines and the combined United/Continental airlines switched to a combined SHARES system on March 3rd, 2012.
At 4:30pm ET, the FAA issued a ground-stop for all United Airlines (including Express) for flights destined to Newark-EWR (90min) or San Francisco-SFO (30min), two of United's hubs.
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