Earth. ISS. Mars. Our universe too!
By-laws of governmental agencies, FAA NASA (US), or, EASA/JAA and ESA(Europe) impose strict requirements that must be met, achieved and demonstrated in the design of aircraft. In the US, these aerospace "laws", referred to as "Part-25" exist to protect the flying public. Fulfilling these obligations is a mammoth task and engineering suppliers assist global OEMS who then often delegate manufacturing to capable partners. We are such a partner.