; and (2) for use by both commercial operators or hobbyists and recreational unmanned aircraft systems, under rules established by the Administrator. (d) Final rule Not later than 1 year after the date of enactment of this Act, the Administrator shall issue a final rule pursuant to the rulemaking conducted under subsection (b). (e) Rules of construction Nothing in this section may be construed to— (1) prohibit the Administrator from promulgating regulations related to the operation of unmanned aircraft systems at more than 400 feet above ground level; or (2) diminish or expand the preemptive effect of the authority of the Federal Aviation Administration with respect to manned aviation. 4. Preservation of State, local, and Tribal authorities with respect to civil unmanned aircraft systems (a) Findings