Flight Certificates do NOT expire And can be used at any time to book and or reschedule. Flight Certificates are refundable for a period of 6 months from the purchase date LESS 15% of the total. Flight Certificates are transferrable to anyone to use to book a flight. 72 Hours’ Notice is required to change, cancel, and or reschedule a flight that is booked and confirmed. See More Important Flight Information & Terms Here »