According to the FareCompare peak travel surcharge chart, American, Delta, Continental, United and US Airways will impose these surcharges from June 10 through August 22. AirTran also
The only day that's exempt during that period is July 4.
You'll also avoid surcharges on routes where these airlines compete with discount carriers like Southwest.
Is there any good news in this chart, especially if you haven't finalized summer travel plans? Well, FareCompare points out that it can help pinpoint when airports will be packed with vacationers --- because those are the days they are expecting the most travelers, and therefore charging the highest fees.