TRB’s Airport Cooperative Research Program (ACRP) Research Results Digest 2: Model for Improving Energy Use in U.S. Airport Facilities provides data on U.S. airports’ utilization of 11 major energy management practices, offers a set of best practices for reducing energy use, and summarizes three case studies of recent recommissioning projects that resulted in significant reductions in energy use. Appendixes A through D of the report—respectiively, “Study of Terminals B and D at Dallas/Fort Worth International Airport”; “Airport Rental Car Facility Case Study”; “Continuous Commissioning of the Matheson Courthouse in Salt Lake City, Utah”; and “Airport Survey Questionnaire”—are available online. A brochure on ACRP RRD 2 is also available online.