It was all over the news:
http://www.kpho.com/news/28203073/detail.html
Computers were down for hours on Friday leaving people unable to check in, print boarding passes, even the website was down. This job posting:
http://newjobsinusa.com/2011/06/senior-programmer-job-vacancy-at-us-airways.html
shows that they use Microsoft technologies which would certainly cause reliability problems. Although I understand in this case the problem was a datacenter power failure. Apparently their backup batteries and generators didn't work as they should. Windows programmers, incompetent datacenter staff, birds of a feather...
Yes, I really do have bumper stickers just like this. I am giving them away FREE! Email your snail-mail address to stranded@usairsucks.org and I will mail you a bumper sticker.