Hartsfield–Jackson Atlanta International Airport now the airport's second largest carrier. In May 2001 construction of an over fifth runway (10–28) began. It was completed at a cost of $1.28 billion and opened on May 27, 2006. It bridges Interstate 285 (the Perimeter) on the airport's south side, making Hartsfield–Jackson the nation's only civil airport to have a runway above an interstate (although Runway 17R/35L at Stapleton International Airport in Denver, Colorado crossed Interstate 70 until that airport closed in 1995). The massive project, which involved putting fill dirt eleven stories high in some places, destroyed some surrounding neighborhoods and dramatically changed the scenery of
Stapleton International Airport operated nonstop service between Denver and London from 1981 to 1982, but thereafter shifted resources to Salt Lake City and Los Angeles; Denver ceased to be a Western hub by the time Delta acquired Western in 1987. Southwest Airlines and People Express tried low-cost service to Denver in the mid-1980s, but Southwest withdrew and People Express was acquired by Continental. In September 1982 the first revenue flight of the Boeing 767 arrived at Stapleton, a United flight from O'Hare International Airport in Chicago. During the energy boom of the early 1980s, several skyscrapers were built in downtown Denver, including Republic