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You can apply for a miles rewards credit card from a major bank. Most major banks issue credit cards that allow earning miles on all purchases. These cards are not tied to a particular airline but allow redeeming miles with any airline, including Asiana Airlines. In addition to regular rewards, there can be a sign up bonus which is often big enough for a round trip ticket. Miles rewards credit cards may also come without annual fees and without foreign transaction fees. So pay attention to the fees as well when you choose a card.