input: [0] Can I make changes later? [1] Subject to the airline. You must work directly with the airline. [2] Yes, within Grand Circle’s policy; see our Terms & Conditions or speak with a Travel Counselor for details. [3] 
output: Maybe. Certain options will allow limited changes for additional fees. New flights or new requests are also subject to airline availability. Published Air options cannot be changed and are nonrefundable.