; and (11) ; (2) in the thirty-third proviso by striking the semicolon and inserting a colon; and (3) by adding at the end the following: Provided further , that the Joint Office shall, in addition to the other duties listed in this paragraph, study, plan, coordinate, and implement issues of joint concern between the two agencies with respect to aircraft and airport decarbonization including at a minimum: (1) research and technical assistance related to the development, certification, operation, and maintenance of sustainable aircraft, including electric propulsion aircraft, medium and heavy duty transportation vehicles, and relevant equipment, including cargo handling equipment, buses, and ride-share vehicles, refueling and charging infrastructure, alternative sustainable low-carbon fuels including sustainable aviation fuels, biofuels, clean hydrogen, methanol and ammonia, and associated technologies critical to their deployment; (2) data sharing with respect to the installation, maintenance, and utilization of charging and refueling infrastructure at airports; (3) development and deployment of workforce training programs related to the development, construction, and maintenance of aircraft, port equipment, and charging and refueling infrastructure; (4) transition from leaded fuel usage by commmercial and general aviation