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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. This credit card comes with unlimited 1.5x miles for every dollar spent on all purchases. What is more, Discover will match ALL the miles you've earned at the end of your first year, automatically (provided you are a new cardmember). For example, if you earn 35,000 miles, you get 70,000 miles. That's $700 towards travel!

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. The Discover it® Miles credit card does not charge annual fee.