OK. Frequent flyer programs keep track of how many miles you have flown. A round trip across the US is, let's say, 6000 miles. So you get 6,000 miles recorded in your account. If you have one of their credit cards, they also record one mile for every dolllar that you spend with the card. So, you really are earning miles using your card. But you need to understand that these are miles flown, not future miles to be flown. Once you have enough miles in your bank, you can redeem them for tickets. More miles, more expensive ticket.
Hope that helps.
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