O'Hare is the 'L' station at the northwestern terminus of the CTA's Blue Line. It is a subway station with two island platforms serving three tracks, located at O'Hare International Airport, 17 miles (27 km) northwest of the Chicago Loop. The station is located underneath the O'Hare parking garage. Trains are scheduled to depart from O'Hare roughly every 2–7 minutes during rush-hour periods and take about 40 minutes to travel to the Loop. It is the westernmost station of the 'L' system. It is also the only CTA station without coordinates in Chicago's grid system, as O'Hare lines up with no street in the city. It is the only CTA terminal located in a subway and also is the only terminal (and station, for that matter) where a premium fare applies and is the only terminal that does not directly connect to any CTA or Pace buses.