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Well, closing a card is not exactly a good move as it may hurt your credit score, but it may be worth it if the $450 annually is too much for you. If you fly Delta a lot, it may as well be worth it, you may take advantage of all the bonuses and the Miles Boost perk before the end of the year and then close it before you are charged with $450.

If the primary purpose of getting the American Express card was earning rewards on Delta, then it is easily achieved by other means. General travel credit cards work great for the frequent flyers.