I'm not sure what it is you're suggesting that the OP might "change later" but if it's the first flight (i.e., ticket it with an AA flight first, so that AA issues the ticket, but then change it to something else), the OP should be aware (particularly during the current 'discount' period) that rule 16(a)(1)(a) says -
"If the first flight is being changed, and the fare level has increased since ticket issuance, the difference between the old and new fare will be charged. If the fare level has decreased since ticket issuance, no refund will apply."