(west). The railway loop has given its name to Chicago's downtown, which is also known as theLoop. Transit began to appear in Chicago in the latter half
subordinate agencies: theChicagoTransitAuthority, Metra, and Pace. Operation of the city's airports is the responsibility of theChicago Department of Aviation
The Blue Line is a 26.93-mile-long (43.34 km) Chicago "L" line which extends through TheLoop from O'Hare International Airport at the far northwest end