American Airlines to begin charging for same day flight changes

Beginning with tickets booked on February 22, 2010 or later, American Airlines will begin charging $50 to change your seat to an earlier or later same day flight. Premium (Elite) fliers, First and Business class customers, and military personnel will still be able to make flight changes at no charge.

Delta, Continental, and US Airways already charge $50 for same day flight changes. United charges $75. Southwest allows same day changes for free if you are traveling on a Business or "Anytime" fare. If you are traveling on their lowest "Wanna Get Away" fares, the fare difference between what you paid and that day's price applies.