The Associated Press reports that multiple airlines are waiving change fees for passengers flying to or from Mexico, where the swine flu scare is thought to have originated. At press time, the airlines allowing a free change included American, United, US Airways, Delta, Continental, and Mexicana. More carriers may follow suit as the situation develops. If you are traveling to Mexico and want to change your flight, check with your airline to see what your options are.
For more information about swine flu, check the FAQ posted by the Centers for Disease Control.