Stapleton, Denver Lake Nature Center, one of the nation's largest urban wildlife refuges. As of 2018, Stapleton has a population of around 75,000 residents living amongst 23,500 households. The Northfield section of the development (north of Interstate 70) still has significant residential and commercial development occurring today. The University of Colorado A-Line directly connecting Denver Union Station downtown to Denver International Airport started operating in 2016 and has one stop in Stapleton; the Central Park Station. Stapleton is served by the Central Park commuter rail and bus station, with direct connections to Union Station in downtown and the Denver International Airport via
Pittsburgh International Airport British Airways, and Wow Air. After United Airlines shifted flights from Newark Liberty International Airport to Washington–Dulles at the Wilkes-Barre/Scranton International Airport, Pittsburgh became the last airport in Pennsylvania to have non-stop flights into EWR. Pittsburgh International Airport is the busiest airport in western Pennsylvania and the second-busiest airport in the state, after Philadelphia International Airport. In 2017 it served 8,988,016 passengers. The airport is encircled by I-376 and Business Loop 376, which is the main access for Airport Cargo and Servicing as well as other flight industries. It is owned by the county and operated by the Allegheny County