; (B) for obstruction removal for the primary runway; (C) for the rehabilitation of the primary runway; or (D) for a project that the Secretary considers necessary for the safe operation of the airport. . (b) Nonprimary apportionment Section 47114(d)(3) of title 49, United States Code, is amended by adding at the end the following: (C) During fiscal years 2019 and 2020— (i) an airport that accrued apportionment funds under subparagraph (A) in fiscal year 2013 that is listed as having an unclassified status under the most recent national plan of integrated airport systems shall continue to accrue apportionment funds under subparagraph (A) at the same amount the airport accrued apportionment funds in fiscal year 2013, subject to the conditions of this paragraph; (ii) notwithstanding the period of availability as described in section 47117(b), an amount apportioned to an airport under clause (i) shall be available to the airport only during the fiscal year in which the amount is apportioned; and (iii) notwithstanding the waiver permitted under section 47117(c)(2), an airport receiving apportionment funds under clause (i) may not waive its claim to any part of the apportioned funds in order to make the funds available for a grant for another public-use airport. (D) An airport that re-establishes its classified status shall be eligible to accrue apportionment funds pursuant to subparagraph (A) so long as such airport retains its classified status. . 149. Evaluation of airport master plans Section 47106 of title 49, United States Code, is amended by adding at the end the following: (h) Evaluation of airport master plans When evaluating the master plan of an airport for purposes of this subchapter, the Secretary shall take into account— (1) the role the airport plays with respect to medical emergencies and evacuations