United’s computers are down and they’ve placed a ground stop on flights. Hopefully things will be rebooted and working quickly, there aren’t a whole lot of flights left tonight and crews could start to time out.
So far United has only informed the FAA of ground stop until 8pm Eastern:
Due to UAL REQUEST, departure traffic destined to UAL airport will not be allowed to depart until at or after 01:00 UTC.
Needless to say aircraft that are out of position to start Monday morning could cause additional problems as the business week begins.
Update: 7:50pm Eastern, ground stop extended an hour until at least 9:00 pm Eastern.
9:02pm Eastern, flights appear to be boarding across the United system. FAA reports ground stop has lifted.