Like with any cheap flight flash sale, there are a few limitations and restrictions. The deals are only for certain days of the week for between August 23rd and November 17th of this year. There are also a few blackout dates, which JetBlue details above the list of flash sale deals on its website, so be sure to check that out before you attempt to book amid the thrill of saving money.
The biggest limitation, however, is that the deal ends on Wednesday, August 10th at 11:59 PM ET, so you have until then to get your damn life together, figure out where you want to go, and book a trip. Good luck.