So based on reading I believe this should work, but would like reassurance. I am looking to book a ticket that has relatively high fare costs in January, there is one flight with a 20 hour overnight layover that is significantly cheaper. My plan is to book that ticket and hope for a schedule change, then ask AA to move me to a flight with a reasonable layover/that gets to my destination same day? Otherwise, I can always cancel the ticket for a voucher and use it for a different flight if the price drops.