Interesting bits: "Departing DEN; taxied and then returned to gate. Pilot says nationwide failure of "three or four" computer systems. Only information from ai

Interesting bits: "Departing DEN; taxied and then returned to gate. Pilot says nationwide failure of "three or four" computer systems. Only information from airport staff is that since the computers are down UAL can't book pax onto any other airline ..." "Systemwide Ground Stop posted at FAA: Due to USER REQUEST DUE TO AUTOMATION ISSUES. UAL AND SUBS ONLY., departure traffic destined to ALL airport will not be allowed to depart until at or after 13:15 UTC."