JetBlue just announced that their schedule has been extended through June 17, 2015. Southwest and JetBlue do a different system of schedule extension than others as they roll it out by periods instead of having it be continually rolling open. So, now you can book your tickets on JetBlue through next summer.
The reason why that is good is because the American Express transfer bonus of Membership Rewards to JetBlue’s True Blue program expires tomorrow. The current bonus gives an even 1:1 ratio instead of the usual 250 MR points to 200 True Blue points. It gives you a good value for domestic and international award redemption on JetBlue with a normal redemption rate of around 1.5 cents per point on JetBlue (though that can actually be even better as seen in this post). Your True Blue points do not expire, so you can transfer your Membership Reward points over to JetBlue and leave them there until you need them. So, with a schedule currently open through the next 9 months and a nice transfer bonus that expires tomorrow, make up your mind today about transferring your Membership Reward points to JetBlue!