The air line reservation system Galileo had significant problems earlier. Excerpt from Reuters: "The outage began about 8:30 p.m. Mountain Daylight Time on Wednesday and lasted until 10:55 a.m. MDT on Thursday, said Beth Tennis, vice present of enterprise networks for Quantitude, Galileo's Denver-based networking subsidiary. It affected three of the four T-1 high-speed data transmission lines supplied to Galileo by AT&T Corp., said Beth Tennis" Although I've found AT&T has the highest reliability of all the carriers I've used. Redundant links from the same carrier frequently have a common vulnerability, the carrier. For things which absolutely can't go down, I assume even AT&T will have occasional problems. Personally I used AT&T Worldnet and Earthlink, alternating depending on who had a problem. That's high praise for me.