We are unable to double book your return flight from New York. We comply with the TSA rules, and a double booking would put an alert on your travel. (You may have an issue with security at the airport) Also AA has an automated systems that searches records and if they see a dupe they cancel both reservations. If you wish to change your flight prior to departure the fee is $200.00, and if there is a fare difference. If you change after you fly, you may change your return 24 hours before traveling and pay $75.00. Please let us know what you would prefer. Thank you.