will be established. (c) Rulemaking Not later than 2 years after the date on which the Administrator identifies the minimum altitude described in subsection (a), the Administrator shall publish in the Federal Register a notice of proposed rulemaking to amend sections 91.817 and 91.818 of title 14, Code of Federal Regulations, and such other regulations as appropriate, to permit flight operations with speeds above Mach 1 at or above the minimum altitude identified under subsection (a) without specific authorization, provided that such flight operations— (1) show compliance with airworthiness requirements