; (2) determine whether it is appropriate to use airport improvement funds and revenues from passenger facility charges to address traffic congestion and passenger travel times between urban commercial centers and airports; and (3) review guidelines and requirements for airport improvement funds and passenger facility charges to determine under what conditions such funds may be used to address traffic congestion in urban commercial centers for travel to airports. 543. FAA employees in Guam (a) In general The Secretary of Transportation shall enter into an agreement with the Secretary of Defense— (1) to allow Federal Aviation Administration employees assigned to Guam, their spouses, and their dependent children access to Department of Defense hospitals located in Guam on a space available basis; and (2) to provide for payments by the Federal Aviation Administration to the Department of Defense for the administrative costs associated with— (A) enrolling Federal Aviation Administration employees assigned to Guam, their spouses, and their dependent children in any Department of Defense system necessary to allow access pursuant to paragraph (1)