The members of the Oversight Board shall be allowed travel expenses, including per diem in lieu of subsistence, at rates authorized for employees of agencies under subchapter
I of chapter
57 of title
5, United States Code, to attend meetings of the Oversight Board and, with the advance approval of the Chairperson of the Oversight Board, while otherwise away from their homes or regular places of business for purposes of duties as a member of the Oversight Board.