Looks like Travelocity was down early today due to a power outage. Here is a screenshot of the site, right after they came up
According to Pingdom, the site was down for ~1 hour and 29 minutes. If they did come up at an alternate site, I personally think that is a pretty good response time. Running a high transaction web site (and one that is as complicated as Travelocity) is no easy feat and when you throw DR into the mix, it gets pretty nasty. The site is primarily hosted out of the EDS/Sabre/Travelocity datacenter in Tulsa, Okhlahoma.