; (B) through grant, contract, or interagency agreements, study the contribution the use of hydrogen would have on propelling commercial aircraft, including hydrogen as an input for conventional jet fuel, hydrogen fuel cells as a source of electric propulsion, sustainable aviation fuel, and power to liquids or synthetic fuel, and research ways of accelerating introduction of hydrogen-propelled aircraft; (C) review grant eligibility requirements, loans, loan guarantees, and other policies and requirements of the FAA and the Department of Energy to identify ways to increase the safe and efficient use of hydrogen to propel commercial aircraft; (D) consider the needs of the aerospace industry, aviation suppliers, hydrogen producers, airlines, airport sponsors, fixed base operators, and other stakeholders when creating policies that enable the safe use of hydrogen to propel commercial aircraft; (E) coordinate with the National Aeronautics and Space Administration, and obtain input from the aerospace industry, aviation suppliers, hydrogen producers, airlines, airport sponsors, fixed base operators, and other stakeholders regarding— (i) the safe and efficient use of hydrogen to propel commercial aircraft within United States airspace, including— (I) updating or modifying existing policies on such use; (II) assessing barriers to, and benefits of, the introduction of aircraft propelled by hydrogen; (III) the operational differences between aircraft propelled by hydrogen and aircraft propelled with other types of fuels; and (IV) public, economic, and noise benefits of the operation of commercial aircraft propelled by hydrogen and associated aerospace industry activity; and (ii) other issues identified by the Secretary, the Administrator, the Secretary of Energy, or the advisory committee established under subparagraph (F) that must be addressed to enable the safe and efficient use of hydrogen to propel commercial aircraft