It'll be a white Christmas throughout much of the United States Saturday: a dream for some and a travel nightmare for others. A Christmas Eve snowstorm covered the Midwest and is moving on to the Southeast. Even Georgia and Tennessee are likely to see serious snow on Saturday. For the first Christmas in 17 years, Nashville and Atlanta will see more than a dusting. The wintry weather is bad news for travelers: Delta had to cancel 500 flights on Saturday. Atlanta, a major flight hub, is seeing the majority of delays.