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How much in credit-card charges do you (or can you) make in an average month? If you want to earn free flights, where do you want to go?
Based upon your income, you are not likely to earn very much in the way of rewards just from your yearly spend; and the better sign-up bonuses typically require a spend of $3K-$4K within the first three months of getting a new card. Can you meet such a spend requirement?