for the purposes of emergency response, cleaning, sanitization, janitorial services, staffing, workforce retention, paid leave, procurement of protective health equipment and training for employees and contractors, debt service payments, infrastructure projects and airport operations. (b) Methodology for disbursement Funds shall be apportioned as set forth in clauses (i) and (ii) of section 47114(c)(1)(C) of title 49, United States Code, and there shall be no maximum apportionment limit. Funds provided under this section shall not be subject to reduced apportionment under section 47114(f) of such title. Any remaining funds shall be distributed to sponsors based on each airport’s passenger enplanements compared to total passenger enplanements of all airports, for the most recent calendar year the Secretary apportioned funds pursuant to section 47114(c). (c) High-Need airports The Secretary shall set aside 2 percent of the remaining funds described in subsection (b) to provide grants to commercial service airports or general aviation airports that demonstrate the highest financial need. (d) Workforce retention (1) In general Except as otherwise provided in this subsection, all airports receiving funds under subsection (a) shall continue to employ, through December 31, 2020, at least 90 percent of the number of individuals employed by the airport as of the date of enactment of this Act. (2) Waiver The Secretary may waive the workforce retention requirement under this subsection 120 days after the date of enactment of this Act if the Secretary determines— (A) the airport is experiencing economic hardship as a direct result of the requirement