Appendix A: Activities at 35 Operational Evolution Plan (OEP) Airports in the United States: 2002

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Key: A/C = aircraft; L = large hubs; M = medium hubs.

Notes: Only scheduled passenger and A/C operations were considered to make the data compatible with T-100 segment data.

Airport hubs in this paper use the U.S. Department of Transportation, Federal Aviation Administration definition. There are four categories of total enplanements (i.e., physical counts): large (> 1% of total enplanements), medium (0.25%-0.999% of total enplanements), small hubs (0.05%-0.249% of total enplanements), and nonhub (< 0.05% of total enplanements). These are physical hubs.

There is a second definition that categorizes airports as a hub where inbound flights are scheduled to arrive from multiple origins within a short period of time thus creating a bank of passengers. The coordinated arrival and departure banks together form a wave of activities and lead to peaks in airlines schedules. Some physical hubs are, thus, operational hubs. However, an airport can be an operational hub without being a physical hub (i.e., airports primarily serving connecting passengers), and a physical hub may exist without being an operational hub (i.e., airports primarily serving origin and destination passengers.

Sources: U.S. Department of Transportation (USDOT), Federal Aviation Administration (FAA), Terminal Area Forecast (TAF) (Washington, DC: 2003); USDOT, FAA, Aerospace Forecasts, 2003-2014 (Washington, DC: U.S. Government Printing Office, 2003); and Official Airline Guide (OAG), available from http://www.oagflights.com.