; (ii) assessing barriers to, and benefits of, the introduction of hydrogen in civil aviation, including 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 (B) other issues identified by the Secretary, the Administrator, the Secretary of Energy, or the advisory committee established under paragraph (7) that must be addressed in order to enable the safe and efficient use of hydrogen in civil aviation. (7) Establish an advisory committee composed of representatives of NASA, the aerospace industry, aviation suppliers, hydrogen producers, airlines, airport sponsors, fixed base operators, and other stakeholders to advise the Secretary, the Administrator, and the Secretary of Energy on the activities carried out under this subsection. (e) International leadership The Secretary, the Administrator, and the Secretary of Energy, in the appropriate international forums, shall take actions that— (1) demonstrate global leadership in carrying out the activities required by subsections (a) and (b); (2) consider the needs of the aerospace industry, aviation suppliers, hydrogen producers, airlines, airport sponsors, fixed base operators, and other stakeholders identified under subsection (b); (3) consider the needs of fuel cell manufacturers