Editing Handley Page (section)

===Interwar period===
In early 1919, a Handley Page V/1500 aircraft, dubbed ''Atlantic'', was shipped to [[Newfoundland (island)|Newfoundland]] to attempt the world's first non-stop [[Transatlantic flight]];<ref>{{Cite web|url=https://www.kaisersbunker.com/rfc/rfc13.htm|title=HP_fabric|website=www.kaisersbunker.com|accessdate=15 October 2022}}</ref> only to be beaten by a [[Vickers Vimy#Operational history|Vickers Vimy]] piloted by [[Alcock and Brown]] in June of that year. The ''Atlantic'' flew into [[New York City]] via [[Canada]] on 9 October 1919, carrying the first [[airmail]] from Canada to the [[United States|United States of America]].<ref>{{Cite web |url=http://www.town.parrsboro.ns.ca/history.html |title=Town of Parrsboro |access-date=20 October 2015 |archive-url=https://web.archive.org/web/20071221043948/http://www.town.parrsboro.ns.ca/history.html |archive-date=21 December 2007 |url-status=dead }}</ref>

In the immediate postwar years, Handley Page modified some O/400's for passenger use, which they flew on the London-Paris route as [[Handley Page Transport]]. The V/1500 was considered too large to be practical at the time, but many design features of the V/1500 were later incorporated into an O/400 airframe to produce their first dedicated passenger design, the [[Handley Page W.8|W.8]]<ref name="Graces" /> that led to a series of similar airliners, fitted with two or three engines, which, aside from being used by Handley Page Transport, were also exported to Belgium.{{Citation needed|date=December 2021}}

In 1924 Handley Page Transport merged with two other airlines to create [[Imperial Airways]], as the UK's national airline service, which continued to use a number of the W.8, W.9 and W.10 series of airliners. Handley Page continued to develop large [[biplane]] airliners, including the luxurious [[Handley Page H.P.42]], for use on [[British Empire|Imperial]] routes to Africa and India.{{Citation needed|date=December 2021}}

Handley Page developed the [[Leading edge slats|Handley Page Slat]] (or slot), an auxiliary airfoil mounted ahead and above the wing, which formed a narrow gap which improved airflow at high [[angle of attack|angles of attack]] and improved low-speed handling.<ref>F. Handley Page [http://www.flightglobal.com/pdfarchive/view/1921/1921%20-%200844.html "Developments In Aircraft Design By The Use Of Slotted Wings"] ''FLIGHT'', 22 December 1921, page 844 and page 845</ref> The leading edge slat was simultaneously designed by the German aerodynamicist [[Gustav Lachmann]], who was later employed by Handley Page. The design was so successful that licensing fees to other companies were their main source of income in the early 1920s.
[[File:Handley page.jpg|thumb|HP [[preference share]] certificate, 1927]]

In 1929, Cricklewood Aerodrome was closed and Handley Page moved the aircraft final assembly to [[Radlett Aerodrome]]. Cricklewood Aerodrome was taken over by [[Cricklewood Studios]], the largest film studio in the UK at that time. Manufacture of aircraft parts and sub-assemblies continued until 1964 at Cricklewood when the remainder of the site was sold off and a [[Wickes]] home renovation store currently occupies the site.{{Citation needed|date=December 2021}}