Bureau of Transportation Statistics (BTS)
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TABLE C-19 Top 20 Transit Agencies by Unlinked Passenger Trips: FY 2005

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Agency Number of unlinked trips (thousands)
MTA New York City Transit (NYCT) 2,758,253
Chicago Transit Authority (CTA) 492,254
Los Angeles County Metropolitan Trip Authority (LACMTA) 451,511
Washington Metropolitan Area Transit Authority (WMATA) 414,076
Massachusetts Bay Transportation Authority (MBTA) 394,851
Southeastern Pennsylvania Transportation Authority (SEPTA) 334,546
New Jersey Transit Corp. (NJTransit) 244,084
San Francisco Municipal Railway (MUNI) 216,918
Metropolitan Atlanta Rapid Transit Authority (MARTA) 142,386
Tri-County Metropolitan Transportation District of Oregon (TriMet) 104,546
Maryland Transit Administration (MTA) 103,366
Miami-Dade Transit (MDT) 103,232
San Francisco Bay Area Rapid Transit District (BART) 99,296
King County Department of Transportation (King County Metro) 98,609
MTA Long Island Rail Road (MTA-LIRR) 95,519
Metropolitan Transit Authority of Harris County, Texas (Metro) 94,555
Denver Regional Transportation District (RTD) 86,261
Metro-North Commuter Railroad Co. (MTA-MNCR) 74,653
Dallas Area Rapid Transit (DART) 72,596
Port Authority Trans-Hudson Corp. (PATH) 71,305
Total, top 20 agencies 6,452,817
Total, all agencies 9,814,683
Top 20 agencies percent of all agencies 65.75

NOTES: Data may not add to total because of independent rounding.

According to the American Public Transportation Association (APTA), an unlinked transit trip is a trip on one transit vehicle. A person riding one vehicle from origin to destination takes one unlinked trip; a person who transfers to a second vehicle takes two unlinked trips; a person who transfers to a third vehicle takes three unlinked trips. A linked trip includes all segments on all vehicles used to travel from origin to destination.

SOURCE: American Public Transportation Association, 2007 Public Transportation Factbook, tables 3 and 4, available at http://www.apta.com/ as of July 2007.