title 49, United States Code, is amended by striking the item relating to section 41718 and inserting the following: 41718. Special rules for Ronald Reagan Washington National Airport. . (f) Schedules for certain transportation of mail Section 41902(a) of title 49, United States Code, is amended by striking section 41906 and inserting section 41905 . (g) Weighing mail Section 41907 of title 49, United States Code, is amended by striking and and all that follows through administrative and inserting and administrative . (h) Structures interfering with air commerce or national security Section 44718(b)(1) of title 49, United States Code, is amended— (1) in the matter preceding subparagraph (A) by striking air navigation facilities and equipment and inserting air or space navigation facilities and equipment