dude,

u should have known better while checking the travel sites like priceline, expedia, travelocity etc etc that its clearly stated there "no changes on schedule" or "charges for rescheduling"....thats why they are offering tickets at a price cheaper than direct airline websites.

furthermore, visit aa.com and airtran.com....they often have tickets lower than or just as low as diff travel sites and their policy on rescheduling is a little easy then travel sites.