If you fly not only Iberia airline, their credit card is of no use for you, as you will not earn rewards when flying with other airlines. If you want to earn miles and redeem them with different airlines, the Discover it® Miles credit card can be an option for you. The card allows earning 1.5 miles on all purchases. All the miles earned during the first year will be matched at the end of the first year (if you are a new cardmember). For example, if you earn 30,000 miles, you will get 60,000 miles. You can redeem earned miles with Iberia or any other airline. This card also comes with no foreign transaction fees, so you can use it abroad without overpaying.
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All rates and fees, and other terms and conditions of the products mentioned in this article/post are actual as of the last update date but are subject to change. See the current products' Terms & Conditions on the issuing banks' websites.