Clifford Ball, pitcairnfield.org An article on the history of PCA , pitcairnfield.org Southwestern Pennsylvania aviation from 1919 to 1930, stvincent.edu (archive.org copy) Fleet listing of Pennsylvania Central aircraft Fleet listing of Capital Airlines aircraft Airlines established in 1948 Airlines disestablished in 1961 History of Allegheny County, Pennsylvania Companies based in Arlington County, Virginia Defunct companies based in Pennsylvania Defunct companies based in Virginia American companies established in 1948 American companies disestablished in 1961 Airlines based in Pennsylvania