Brian Field (15 December 1934 – 27 April 1979) was a solicitor's clerk who was one of the masterminds of the 1963 Great Train Robbery.
 He was the crucial link between the key informant known only as ""Ulsterman"" (who came up with the idea of robbing the money-laden night mail train and also provided the details of the schedule and contents of the trains) with the actual gang capable of planning and carrying out such a complex and large scale robbery.
 He was found guilty of Conspiracy to Rob but his conviction was later overturned on appeal.
 Field only served time in prison for Obstruction of Justice in relation to arranging the purchase of Leatherslade Farm, near Oakley, Buckinghamshire which was used as the gang's hideout.
Dan-Air Flight 240 was a fatal accident involving a Hawker Siddeley HS 748 series 2A turboprop aircraft operated by Dan Air Services Limited on the first stage of a night mail flight from London Gatwick Airport to East Midlands Airport.
 The crash, which occurred on 26 June 1981 near the village of Nailstone, Leicestershire, following major structural failure caused by the failure of a cabin door, resulted in the aircraft's destruction and the deaths of all three on board (both pilots and a cabin attendant).
Protected is a 1975 documentary film, narrated by Don Brady and Sydney born producer Robert Hughes.
 The film was directed by Alessandro Cavadini.
 It was an exposé of the ill-treatment of Aboriginal workers by white men.
 The details of what life was like for Aboriginal Australians on Palm Island became more widely known when Alessandro Cavadini and Carolyn Strachan recreated the strike in 1957 by hundreds of the Island’s residents even though there was huge resistance from local authorities.
Night Mail is a 1936 documentary film about a London, Midland and Scottish Railway (LMS) mail train from London to Scotland, produced by the GPO Film Unit.
 The film ends with a "verse commentary" by W. H. Auden, written for existing footage.
 Benjamin Britten scored the film.
 The film was directed by Harry Watt and Basil Wright, and narrated by John Grierson and Stuart Legg.
 The Brazilian filmmaker Alberto Cavalcanti was sound director.
 The locomotive featured in the film was Royal Scot 6115 "Scots Guardsman", built in 1927.
 The film has become a classic of its own kind, much imitated by adverts and modern film shorts.
 "Night Mail" is widely considered a masterpiece of the British Documentary Film Movement.
Night Mail is a 1935 British film.
 It is not to be confused with the 1936 documentary "Night Mail".
Gousset was a component of late Medieval armor.
 During the transition from mail to plate armor, sections of mail covered parts of the body that were not protected by steel plate.
 These sections of mail were known as gousset.
 Gousset came into use in the fourteenth century as plate became a structural part of a suit of knightly armor rather than an addition strapped over a suit of mail.
 During the fourteenth century there was considerable variation in the ratio of gousset to plate.
The Nieuport-Delage NiD 740 was a French trimotor monoplane designed to carry night mail.
 Two were built in 1930.
Night Mail (Chinese: 死亡邮件) is a 2014 Chinese crime suspense thriller film directed by Li Yu.
 It was released on 20 June 2014.
The Aerial Board of Control is a fictional supranational organization world to manage air traffic for the whole world.
 It was described in the early science fiction stories of Rudyard Kipling, "With The Night Mail" ("The Windsor Magazine", December 1905; "McClure's Magazine", November 1905) and "As Easy as ABC" ("The London Magazine" 1912).
 The organisation was able to limit the influence of national states and create a de facto world government.
The derailment of the Night Mail occurred on the North Eastern Railway when an axle suddenly fractured on 28 December 1869 at Dalton Junction, near Darlington, County Durham, England.
 There were only slight injuries among the staff, but was a warning of the problem of premature axle failure.

Question: Are both Protected and Night Mail documentaries?
Answer: yes