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If you want to earn miles for Air China flights, you may choose from travel rewards credit cards with miles or points rewards. For example, you may like the Discover it® Miles credit card. Using this card, you will earn unlimited 1.5x miles for every dollar spent on all purchases all with no annual fee. All the miles that you've earned during your first year are matched at the end of the year (provided you are a new cardmember). So, if you earn 35,000 miles, you get 70,000 miles. Earned miles can be redeemed for airline tickets or other travel expenses like hotel stays, cruises, car rentals and more. Miles never expire. This card has no foreign transaction fee.