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Public Transportation Market Share by Airport 79 from the calculation). One traditional public transportation bus is operated to Columbia, Maryland. Chicago O'Hare (12% Market Share) Market Share U.S. Rank Airport Total Rail Bus/Van 12 O'Hare International Airport 12% 5% 7% SOURCE: Chicago Origin-Destination Survey Report (20) The Airport. O'Hare International Airport is located about 18.5 miles from the center of Chicago. The airport served about 76.5 MAP in 2005; of these, some 14.9 million were originat- ing passengers. Under conditions of no highway congestion, the driving time from the airport to downtown is 23 minutes. The airport currently attracts about 1.8 million travelers per year who use public, high-occupancy modes to the airport. Connections at the Airport. O'Hare airport is served directly by the Chicago Transit Authority (CTA) Blue Line, with a terminal located within the central parking garage, about 1000 feet from Terminals 1, 2, and 3. To access Terminal 5, the international terminal, an automated people mover must be used. In addition, a free shuttle bus connects the terminals with the Metra commuter rail system. A consolidated bus/shuttle center is located immediately above the rail station, on the first level. The major bus/van system to downtown, the Airport Express, operates from curb locations near each of the major terminal baggage collection areas. Rail. The train station at O'Hare airport has the highest use rates of any U.S. on-airport tran- sit station, with more than 7,000 transit boardings per day. Of these boardings, surveys show that fewer than 20% are air travelers, with most of the others working at the airport. Although rail service has somewhat longer travel times than taxi service in off-peak hours, rail benefits from greater travel-time reliability during peak hours. According to the most recent data, between 4% and 5% of O'Hare ground access air travelers choose the CTA train service, while 5% choose airport van and less than 3% choose other forms of buses. In the most recent survey efforts, a logical catchment area was defined, including a cen- tral Chicago area, with both a northern and a southern market area. For the prime market area for existing services (and for an express concept now under examination), 12% of travelers take the existing Blue Line train, with an additional 15% taking buses and van services. Bus. Continental Airport Express operates both the downtown hotel shuttle loops and door- to-door service throughout the region. Suburban bus service is operated by PACE to downtown Evanston, Illinois. Six private bus/van companies run direct service to locations in Wisconsin, Indiana, and Iowa and several destinations in Illinois. According to earlier CTA surveys, about 5% of airline passengers used the CTA rail services to or from the airport. There is little variation in rail ridership by air travel purpose: business travel- ers choose rail at about the same rate as non-business travelers. Rail was slightly more attractive to travelers going to the airport than from the airport. CTA analysts note that almost two-thirds of those arriving at the airport had local origins outside of the CTA service area; within the tran- sit agency's service area, airline passenger rail market share was estimated at 15% (21). In a 1990 survey, CTA services were found to be used more to the airport (5.8%) than from the airport (4.9%). The service is more often used by residents than non-residents, with 21% of departing residents choosing rail. Although about 60% of airline passengers are non-residents, fewer than 20% of airline passengers who use the train are non-residents.