Affirm will sometimes require a down payment of a fixed amount when to first begin the loan process for your flight ticket reservation. Once the down payment has been paid, Affirm will loan you the money for the remainder of the flight reservation. Your payment options depend on the amount of your purchase and on your eligibility. Smaller purchases can be made in 4 interest-free payments every two weeks with Pay in 4. For larger purchases, the option to make 3, 6, 12, or 18 monthly payments are available and these options may have interest. Note that the loan is to be paid off directly to Affirm and not to Alternative Airlines.