Stapleton International Airport Stapleton International Airport Stapleton International Airport was the primary airport serving Denver, Colorado, United States from 1929 to 1995. At different times it served as a hub for Continental Airlines, the original Frontier Airlines, People Express, Trans World Airlines (TWA), United Airlines and Western Airlines. Other airlines with smaller hub operations at Stapleton included Aspen Airways, the current version of Frontier Airlines and Rocky Mountain Airways, with all three of these air carriers being based in Denver at the time. In 1995, Stapleton was replaced by Denver International Airport. It has since been decommissioned and the property redeveloped as a
Stapleton International Airport Western began flights to Calgary. The Boeing 747 was introduced to Stapleton on Continental's Los Angeles route in 1970. In the early 1970s, Frontier occupied Concourse A, United occupied most of Concourse B, and Western and Continental occupied most of Concourse C. United and TWA served both coasts nonstop during this era, while Continental and Western's nonstop flights only extended to the western half of the country. Concourse D was built in 1972. After deregulation, Denver's four major incumbent airlines developed hubs at Stapleton. United occupied Concourse B, Continental and Western occupied Concourse C and Frontier occupied Concourse D. Western