JetBlue is having another sale, but few of these fares are at historic lows: they're just a bit lower than what they were before.
For example, we've seen Boston to Orlando much lower than the $248 RT JetBlue is now charging. In fact, JetBlue has a lower fare on the route for travel through Feb 28 for $159 RT, nonstop.
And JFK to West Palm Beach at $99 each way? Sun Country is flying that route for as low as $119 RT on nonstop flights. And even JetBlue has $139 RT fares nonstop for Jan/Feb travel if you fly on a Tue/Wed/Sat.
And JetBlue is selling $250 RT's between JFK and Vegas via Travelocity and on its own site, but this "sale" lists the route at $328 RT, which is expensive. So we really don't get this sale at all.