Such travel rewards credit cards like the Discover it Miles have flexible rewards programs allowing you to redeem miles with any airline. So, you will have no problems redeeming reward miles with JetBlue airline. The travel credit cards are also good for those who travel abroad because they often come without a foreign transaction fee and with chip technology. And of course having different credit accounts is good for your credit score. The possible drawback can be annual fees which often charged when big rewards are offered. Discover does not charge annual fees though.