I'm quite fuzzy on this - so forgive me if I mess up the details - but apparently as of 7/22/2011 the Government airline tax has expired, and airlines no longer have the right to collect these taxes on flights taking place after 7/22, even if tickets were purchased before that date (the fees are passed along to the government at the time of the flight). Any flights that take place after 7/22 but before this issue is resolved will be due a refund of the government tax that was collected at the time of purchase - somewhere around $25 per ticket. Some airlines are instructing people to contact the IRS, some are issuing the refund directly. JetBlue has information on their website that they will issue a refund to anyone traveling in the next 7 days, but further out than that will need to wait for further information. The full article from USA Today is linked below. Hopefully we can all get some $$ back!!
http://travel.usatoday.com/flights/post/2011/07/airline-fees-tax-holiday/178394/1
http://travel.usatoday.com/flights/post/2011/07/airline-fees-tax-holiday/178394/1