(a) For air transportation taking place before January 1, 2019, an air carrier certificated under 49 U.S.C. 41102 that accounts for at least 1 percent of domestic scheduled-passenger revenues in the most recently reported 12-month period as defined by the Department's Office of Airline Information, and as reported to the Department pursuant to part 241 of this title shall, for the flights it operates, report monthly to the Department on a domestic system basis, excluding charter flights, the total number of passengers enplaned system-wide and the total number of mishandled-baggage reports filed with the carrier for any nonstop flight, including a mechanically delayed flight, to or from any airport within the contiguous 48 states that accounts for at least 1 percent of domestic scheduled-passenger enplanements in the previous calendar year, as reported to the Department pursuant to part 241 of this title.

(b) For air transportation taking place on or after January 1, 2019, an air carrier certificated under 49 U.S.C. 41102 that accounts for at least 0.5 percent of domestic scheduled-passenger revenues in the most recently reported 12-month period as defined by the Department's Office of Airline Information, and as reported to the Department pursuant to part 241 of this title shall report monthly to the Department on a domestic system basis, excluding charter flights:

(1) The total number of checked bags enplaned, including gate checked baggage, “valet bags,” interlined bags, and wheelchairs and scooters enplaned in the aircraft cargo compartment for any domestic nonstop scheduled passenger flight, including a mechanically delayed flight, operated by the carrier to or from any U.S. large, medium, small or non-hub airport as defined in 49 U.S.C. 41702 and separately for any domestic nonstop scheduled passenger flight, including a mechanically delayed flight, held out with only the carrier's designator code to or from any U.S. large, medium, small, or non-hub airport as defined in 49 U.S.C. 47102 and operated by any code-share partner that is a certificated air carrier or commuter air carrier;

(2) The total number of wheelchairs and scooters that were enplaned in the aircraft cargo compartment for any domestic nonstop scheduled passenger flight, including a mechanically delayed flight, operated by the carrier to or from any U.S. large, medium, small or non-hub airport as defined in 49 U.S.C. 41702 and separately for any domestic nonstop scheduled passenger flight, including a mechanically delayed flight, held out with only the carrier's designator code to or from any U.S. large, medium, small, or non-hub airport as defined in 49 U.S.C. 47102 and operated by any code-share partner that is a certificated air carrier or commuter air carrier;

(3) The number of mishandled checked bags, including gate-checked baggage, “valet bags,” interlined bags and wheelchairs and scooters that were enplaned in the aircraft cargo compartment for any domestic nonstop scheduled passenger flight, including a mechanically delayed flight, operated by the carrier to or from any U.S. large, medium, small or non-hub airport as defined in 49 U.S.C. 41702 and separately for any domestic nonstop scheduled passenger flight, including a mechanically delayed flight, held out with only the carrier's designator code to or from any U.S. large, medium, small, or non-hub airport as defined in 49 U.S.C. 47102 and operated by any code-share partner that is a certificated air carrier or commuter air carrier; and

(4) The number of mishandled wheelchairs and scooters that were enplaned in the aircraft cargo compartment for any domestic nonstop scheduled passenger flight, including a mechanically delayed flight, operated by the carrier to or from any U.S. large, medium, small or non-hub airport as defined in 49 U.S.C. 41702 and separately for any domestic nonstop scheduled passenger flight, including a mechanically delayed flight, held out with only the carrier's designator code to or from any U.S. large, medium, small, or non-hub airport as defined in 49 U.S.C. 47102 and operated by any code-share partner that is a certificated air carrier or commuter air carrier.

(c) The information in paragraphs (a) and (b) of this section shall be submitted to the Department within 15 days after the end of the month to which the information applies and must be submitted with the transmittal accompanying the data for on-time performance in the form and manner set forth in accounting and reporting directives issued by the Director, Office of Airline Information.