; (2) review economic trends that have resulted in reduction or loss of scheduled commercial air service to such communities; (3) review the economic losses of such communities who have suffered a reduction or loss of scheduled commercial air service; (4) identify the causes that prompted air carriers to reduce or eliminate scheduled commercial air service to such communities; (5) assess the impact of changing aircraft economics; and (6) identify recommendations that can be implemented by such communities or Federal, State, or local agencies to aid in the restoration or replacement of scheduled commercial air service. (c) Case studies In conducting the study required under subsection (a), the National Academies shall assess not fewer than 7 communities that have lost commercial air service or have had commercial air service significantly reduced in the past 15 years, including— (1) Williamsport Regional Airport; (2) Alamogordo-White Sands Regional Airport; and (3) Chautauqua County Jamestown Airport. (d) Report Not later than 1 year after the date of enactment of this Act, the National Academies shall submit to the Secretary and the appropriate committees of Congress a report containing— (1) the results of the study described in subsection (a)