If you are a member of American Express Membership Rewards you can transfer your Membership Rewards points, in 250 point increments, to your JetBlue TrueBlue account. Usually, 250 American Express Membership Rewards points equals 200 TrueBlue points.
But through November 30, 2017, Amex is offering a 25% transfer bonus to JetBlue. Instead of the normal 250:200 transfer ratio, when you transfer 250 Amex points to JetBlue TrueBlue, you will end up with 250 points. If you need JetBlue points, consider transferring before 11/30.