; (iii) any difference in the fare likely to be paid for a ticket sold to another passenger for a seat made available by the change or cancellation, as compared to the fare that was paid for the seat for which the reservation was changed or canceled; and (iv) the likelihood that the passenger changing or canceling the reservation will, as a result, fill a seat on another flight by the same air carrier; (B) the costs of processing the change or cancellation electronically; and (C) any related labor costs; (2) with respect to a fee described in subsection (b)(2) imposed by an air carrier relating to checked baggage— (A) the costs of processing checked baggage electronically; and (B) any related labor costs; (3) with respect to a fee described in subsection (b)(3) imposed by an air carrier relating to the choice or assignment of seats on a flight in passenger air transportation, ensuring that passengers traveling with children age 13 or younger are able to be seated with those children at no additional charge to the passengers traveling with such children or to any other passenger traveling on the flight involved; and (4) any other considerations the Secretary considers appropriate. (d) Updated regulations The Secretary shall update the standards required by subsection (a)(2) not less frequently than every 3 years. (e) Definitions In this section: (1) Air carrier The term air carrier means any air carrier that holds an air carrier certificate under section 41101 of title 49, United States Code. (2) Passenger air transportation The term passenger air transportation means, with respect to the transportation of passengers by aircraft as a common carrier for compensation, foreign air transportation, interstate air transportation, and intrastate air transportation, as such terms are defined in section 40102 of title 49, United States Code.