; (B) economic and operational factors which results in oversales; (C) whether, and if so how, the incidence of oversales varies depending on markets; and (D) potential consequences on the limiting of oversales. (3) Report Not later than 1 year after the date of enactment of this Act, the Comptroller General shall submit to the appropriate committees of Congress a report on the review under paragraph (2). (f) Notice of policies of air carriers Not later than 1 year after the date of the enactment of this Act, the Secretary of Transportation shall prescribe regulations requiring an air carrier, or other entity selling tickets for flights in passenger air transportation, to specify, on a passenger's flight itinerary, receipt, or other direct customer communication, the policies of the air carrier operating the flight regarding oversold flights. (g) Definition of air carrier In this section, the term air carrier means an air carrier or foreign air carrier, as those terms are defined in section 40102 of title 49, United States Code. 3119. Transparency for disabled passengers The compliance date of the final rule, dated November 2, 2016, on the reporting of data for mishandled baggage and wheelchairs in aircraft cargo compartments (81 Fed. Reg. 76300) shall be effective January 1, 2018. B Essential air service 3201. Essential air service (a) Authorization extension Section 41742(a) is amended— (1) in paragraph (2), by striking $150,000,000 and all that follows though 2017 and inserting $175,000,000 for each of fiscal years 2018 through 2021 ; and (2) by striking paragraph (3). (b) Definitions Section 41731(a)(1)(A) is amended by striking clause (ii) and inserting the following: (ii) was determined, on or after October 1, 1988, and before December 1, 2012, under this subchapter by the Secretary of Transportation to be eligible to receive subsidized small community air service under section 41736(a)