Question: What trade in common do Debarun Pal and Peter Duffell share?

Context articles: Peter Duffell
King of the Wind (film)
Caught on a Train
Norokhadok Brikkho
Inside Out (1975 film)
Philippine Airlines
The Winged Avenger
Debarun Pal
England Made Me (film)
The House That Dripped Blood

Peter Duffell (born 1937) is a British film and television director and screenwriter, born in Canterbury, England.
King of the Wind is a 1990 British adventure film directed by Peter Duffell and starring Richard Harris, Glenda Jackson and Frank Finlay.
 It is based on the novel "King of the Wind" by Marguerite Henry.
 The film depicts the life of the Godolphin Arabian, an Arab colt in 18th-century Kingdom of Great Britain.
Caught on a Train is a critically successful British television play written by Stephen Poliakoff and directed by Peter Duffell, based on an overnight train journey across Europe, and following the route of a journey that Poliakoff had himself made from London to Vienna.
 It was first shown, on BBC1, on 31 October 1980, and was re-shown in 2001 and 2006.
Norokhadok Brikkho is a Bengali adventure thriller film directed by Debarun Pal, The film was released on 5 December 2013 and it was screened at Nandan, Kolkata at the Kolkata Short Film Festival 2013.
 It stars Plaban Chakraborty, Krishnasish Pal and Dipa Bose.
 The plot revolves around a deserted village that leads a Man-Eater Tree.
 The film gained positive response from both the audience and critics.
Inside Out is a 1975 British action thriller film, produced and directed by Peter Duffell, and starring James Mason, Robert Culp, and Telly Savalas.
 The movie.
 shot in West Berlin and the Netherlands, aired on television in the United States on NBC on 1 January 1978 under the alternate title "Hitler's Gold".
 It was also titled "The Golden Heist", and "Ein genialer Bluff" (in West Germany).
 It was an inspiration for the film Wild Geese II.
Philippine Airlines (PAL), a trade name of PAL Holdings, Inc. (PSE: PAL), also known historically (until 1970) as Philippine Air Lines, is the flag carrier of the Philippines.
 Headquartered at the PNB Financial Center in Pasay City, the airline was founded in 1941 and is the first and oldest commercial airline in Asia operating under its original name.
 Out of its hubs at Ninoy Aquino International Airport of Manila, Clark International Airport of Angeles and Mactan-Cebu International Airport of Cebu, Philippine Airlines serves 31 destinations in the Philippines and 41 overseas destinations in Southeast Asia, East Asia, Middle East, Oceania, North America and Europe.
"The Winged Avenger" is the sixth episode of the fifth series of the 1960s cult British spy-fi television series "The Avengers", starring Patrick Macnee and Diana Rigg, and guest starring Nigel Green, Colin Jeavons, Jack MacGowran, and Neil Hallett.
 It was first aired on ABC on 18 February 1967.
 The episode was directed by Richard Harris, and written by Gordon Flemyng & Peter Duffell.
Debarun Pal (born February 14, 1987) is an Indian Film Editor, Film Director & Cinematographer.
 He shoots and produces many of his films in his native Kolkata and India.
 He has directed successful and groundbreaking Bengali Films such as Norokhadok Brikkho in 2013, which was one of the first commercial hit, under his own production house The Emperor Studios.
England Made Me is a 1973 British drama film directed by Peter Duffell, starring Peter Finch, Michael York, Hildegarde Neil, and Michael Hordern, and based on the novel "England Made Me" by Graham Greene.
 Tony Wollard's art direction was nominated for a British BAFTA Award.
 The film changes the novel's setting from Sweden to Nazi Germany.
 Duffel explained that he changed the location due to his lack of knowledge of Sweden in the 1930s, the use of imagery the audience would recognise and the growing menace in Europe of the time.,
The House That Dripped Blood is a 1971 British horror anthology film directed by Peter Duffell and distributed by Amicus Productions.
 It stars Christopher Lee, Peter Cushing, Nyree Dawn Porter, Denholm Elliott, and Jon Pertwee.
 The film is a collection of four short stories, all originally written and subsequently scripted by Robert Bloch, linked by the protagonist of each story's association with the eponymous building.
 The film carries the tagline "TERROR waits for you in every room in "The House That Dripped Blood"."