 In the past , Denver has been home to several other airports that are no longer operational . Stapleton International Airport was closed in 1995 when it was replaced by DIA . Lowry Air Force Base was a military flight training facility that ceased flight operations in 1966 , with the base finally being closed in 1994 . It is currently being used for residential purposes . Buckley Air Force Base , a former Air National Guard base , is currently the only military facility in the Denver @-@ Metro area . 
