; and (2) if the Secretary determines that such a limitation is necessary, consider whether to impose such a limitation based on a percentage of the seats available on an aircraft. (d) Regulations relating to accommodation of air carrier employees Not later than 180 days after the date of the enactment of this Act, the Secretary shall prescribe regulations requiring an air carrier seeking accommodation on a flight for an employee of the air carrier or another air carrier to check that employee in for the flight not later than 60 minutes before the flight is scheduled to depart. (e) Notice of policies of air carriers on oversold flights Not later than 180 days after the date of the enactment of this Act, the Secretary shall prescribe regulations requiring— (1) an air carrier, or other entity selling tickets for flights in passenger air transportation, to specify, on a passenger's flight itinerary and receipt, the policies of the air carrier operating the flight with respect to oversold flights and with respect to requiring passengers to give up seats to employees of the air carrier; and (2) an air carrier to post those policies publicly at each gate of the air carrier at an airport. (f) Air carrier defined 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.