It can't be done, Jetblue does not have any transatlantic flights and their points are not redeemable on any airlines that do. The TrueBlue program also offers a horrible return on discount coach fares compared to traditional mileage based programs. Jetblue has a lot of nonstops out of Boston, but very little else to offer a frequent flyer.

There are a handful of Jetblue flights out of Boston where you can earn AA miles instead of TrueBlue points, but it's a huge hassle and generally not worth it.