The Joint Commercial Aircraft Working Group (JCAWG) consists of members from INCOSE, other professional societies, major aircraft manufacturers, regulatory agencies, suppliers, and other companies in the commercial aircraft domain. JCAWG is chairing the development of a supplemental guideline for the Commercial Aircraft Transport Domain under the title of “Guidelines for the Application of Systems Engineering in the Commercial Aircraft Domain.” The primary purpose of the Guidelines is to span the gap between the ANSI/EIA standard and other guidelines in the aircraft industry. These Guidelines are expected to be the forerunner for similar guidelines in other application domains.