When Cate & McGlone of Hollywood produced the film “JET MAINLINER Flight 803” for United Airlines in 1960, the subject of the film, the Douglas DC-8-21 airliner, had been in production for only a few months. Many of United’s initial batch of DC-8s were DC-8-11s which were upgraded to DC-8-12s and subsequently brought up to the DC-8-21 specifications over the next few years. United eventually became the largest DC-8 operator. The film, uploaded to Youtube by PeriscopeFilm, stars the United Airlines DC-8-21 Jet Mainliner.