or foreign air carrier at the time of such scheduling qualifies as unrealistic or deceptive scheduling. (2) Rulemaking Not later than 90 days after receiving the recommendations under paragraph (1), the Secretary shall initiate a rulemaking to implement any such recommendations determined appropriate by the Secretary. 703. Refunds (a) In general Chapter 423 of title 49, United States Code, is amended by inserting after section 42304 the following: 42305. Refunds for cancelled or significantly delayed or changed flights (a) In general In the case of a passenger that holds a nonrefundable ticket on a scheduled flight to, from, or within the United States, an air carrier or a foreign air carrier shall, upon request of the passenger, promptly provide a full refund, including any taxes and ancillary fees, for the fare such carrier collected for any cancelled flight or significantly delayed or changed flight where the passenger chooses not to— (1) fly on the significantly delayed or changed flight or accept rebooking on an alternative flight