The purpose of this part is to ensure that carriers promptly refund consumers for:

(a) Fees for ancillary services related to air travel that consumers paid for but were not provided;

(b) Fees to transport checked bags that are lost or significantly delayed; and

(c) Airfare including nonrefundable airfare for a flight that is cancelled or significantly changed where the consumer does not accept the significantly changed flight or rebooking on an alternative flight, or accept any voucher, credit, or other compensation offered by the carrier.