; . 5. Extension of taxes funding the airport and airway trust fund (a) Sections 4081(d)(2)(B), 4261(j), 4261(k)(1)(A)(ii), and 4271(d)(1)(A)(ii) of the Internal Revenue Code of 1986 shall be applied by substituting October 7, 2018 for September 30, 2018 . (b) Section 4083(b) of such Code shall be applied by substituting October 8, 2018 for October 1, 2018 .