The Airports Authority operates a two-airport system Reagan National and Dulles International airports, which provides domestic and international air service for the mid-Atlantic region. The Airports Authority's structure includes central administration, airports management and operations, and police and fire departments. In addition to operating Reagan National and Dulles, the Airports Authority is responsible for the daily operation, maintenance and control of the Dulles Toll Road, along with the management of the Dulles Corridor Metrorail project to extend Metrorail service to Dulles Airport and Loudoun County.