; and (iv) the likelihood that the passenger changing or cancelling 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 a passenger traveling with children who are 13 years of age or younger are able to be seated with those children at no additional charge to the passenger traveling with such children or to any other passenger traveling on the flight involved