; (3) the number of hours aircraft are in flight over the life of the aircraft and the average number of hours on domestic and international flights , respectively; (4) the impact of metal fatigue on aircraft usage and safety; (5) a review on contractor assisted maintenance of commercial aircraft; and (6) a re-evaluation of the rules on inspection of aging airplanes. 577. Report on aircraft diversions from lax to hawthorne municipal airport Not later than 1 year after the date of the enactment of this Act, the Administrator of the Federal Aviation Administration shall issue and make available to the public a report on diversions of aircraft from Los Angeles International Airport (LAX) to Hawthorne Municipal Airport, also known as Jack Northrop Field, in the City of Hawthorne, California. This report shall cover at least the previous one-year period and include the total number of aircraft diversions, the average number of diversions per day, the types of aircraft diverted, and the reasons for the diversions. 578. Former military airports Section 47118(a) of title 49, United States Code, is amended— (1) in paragraph (1)(C) by striking “or” at the end; (2) in paragraph (2) by striking the period at the end and inserting “; or”; and (3) by adding at the end the following: (3) the airport is— (A) a former military installation; and (B) a primary airport. . 579. Use of State highway specifications Section 47114(d)(5) of title 49, United States Code, is amended to read as follows: (5) Use of State highway specifications The Secretary shall use the highway specifications of a State for airfield pavement construction and improvement using funds made available under this subsection at nonprimary airports serving aircraft that do not exceed 60,000 pounds gross weight if— (A) such State requests the use of such specifications; and (B) the Secretary determines that— (i) safety will not be negatively affected