PDARS > Benefits     This process enables FAA users to quickly focus on operationally significant problems. User-needs studies conducted at the facilities identified information and analysis capabilities required to monitor performance and safety. These studies provided the initial guidelines for the customized daily reports produced by PDARS for each facility. Reports continue to evolve as users gain familiarity with the tools. Specific state-of-the-art performance measures made possible by PDARS include:     Travel times within geometric areas (sectors, facilities, etc.). Travel times for routing segments (arrival fix to runway, runway to departure fix, facility boundary to/from runway, etc.). Flow counts over user-defined points. Throughput counts for airports, sectors, etc. Ground speed distributions at user-defined times and areas. Identification of aircraft deviating from a prescribed procedure.     Analytical tools and displays support exploratory and causal analysis of ATC radar-track data. The system also produces comprehensive archives of basic operational data and measurements that support baseline development and before-and-after studies of procedural changes.     PDARS has now been been designed, implemented and fielded for operation in all 20 Air Route Traffic Control Centers in the U.S. These include facilities in the Western-Pacific, Southwestern, Southern and Central ATC Regions; and at the System Command Center, Herndon, VA.