the location of the runways is limited by the location of the airport. it has not changed much over time. one of the few changes was made in 1956. the fourth runway was closed. it was an east-west runway. it is now used just for moving aircraft and for parking them. the terminal building was made larger in 1958. the north terminal was added. the two buildings were connected in 1961. a united airlines building was built in 1965. facilties for american airlines were built in 1968. a commuter terminal was built in 1970.