In June 2011 as well (http://seattletimes.com/html/localnews/2015353612_united18m.html http://seattletimes.com/html/localnews/2015353612_united18m....), a week

In June 2011 as well (http://seattletimes.com/html/localnews/2015353612_united18m.html http://seattletimes.com/html/localnews/2015353612_united18m....), a week after the same happened with U.S. Airways (http://www.ajc.com/news/business/computer-glitch-grounds-us-airways-flights/nQwKx/ http://www.ajc.com/news/business/computer-glitch-grounds-us-...).