; and (B) the Secretary considers the price referred to in subparagraph (A) to be reasonable. (3) If the Secretary and the lawful owner of an interest in land described in paragraph (1) are unable to agree to lease, contract for, or buy such interest at a reasonable price for such lease, contract, or purchase, the Secretary may commence condemnation proceedings pursuant to the Act of August 1, 1888 (Chapter 728; 25 Stat. 357). . 1113. Air and Marine Operations flight hours (a) Increased flight hours The Secretary shall ensure that not fewer than 95,000 annual flight hours are carried out by Air and Marine Operations of U.S. Customs and Border Protection. (b) Unmanned aerial system The Secretary shall ensure that Air and Marine Operations operate unmanned aerial systems on the southern border of the United States for not fewer than 24 hours per day for 5 days per week. (c) Contract air support authorization The Commissioner shall contract for any additional aviation services needed to fulfill identified air support mission critical hours, as identified by the Chief of the U.S. Border Patrol. (d) Primary mission The Commissioner shall ensure that— (1) the primary missions for Air and Marine Operations are to directly support U.S. Border Patrol activities along the southern border of the United States and Joint Interagency Task Force South operations in the transit zone; and (2) the Executive Assistant Commissioner of Air and Marine Operations assigns the greatest priority to support missions established by the Commissioner to carry out the requirements under this Act. (e) High-demand flight hour requirements In accordance with subsection (d), the Commissioner shall ensure that U.S. Border Patrol Sector Chiefs— (1) identify critical flight hour requirements