If you do not stick strictly to Sun Country Airlines, 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 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 if you are a new cardmember. For example, if you earn 50,000 miles, they will become 100,000 miles, You can redeem earned miles with Sun Country or any other airline. This card also comes with no foreign transaction fees, so you can use it abroad.
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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.