I have a Flight credit that has a use by date of 27th Feb. However I have a back surgery coming up which means that flying will be reduced for a while. Does anyone know if I am able to book a flight that leaves before the expiry date of 27th Feb and then if I were to cancel this flight into a credit does the new expiry date on the flight credit move to 1 year out ie 27feb 2028? (The original flight was a fully refundable flight but I don’t want to refund it if possible) Thank You! 
