USA
A weapons systems support and training systems designer/manufacturer of Los Angeles, California; produced a series of very original experimental ultralight helicopters from 1940, as well as a helicopter training system. Production ended by 1974.
Manufacturer
Delhamende
Belgium
Took over production of the D-158 Tipsy Nipper from Avions Fairey Beige, designed originally by M. Tips to be sold as a kit. Delhamende marketed it under the name Cobelavia from the early 1960s. and sold all Nipper rights to Nipper Aircraft in the U.K. in 1966.
Delfosse, Arthur
Arthur Delfosse (Germany, 1883-1956) built his first motorcycle at the age of 15. In 1902 he made his first gliding experiments on the Mülheimer Heide in Cologne with a homemade airplane. In 1909 Delfosse built a Blériot-like monoplane.
Subsequently he founded the first aircraft engine factory in Germany.
Delest, Juan Alberto

Warrant Officer Albert Jean Delest – Born February 7, 1891 in Buenos Aires (Argentina) – Son of Jean Albert Delest and Charlotte Moras.
Pre-war Engineer Electrician – Married, with a boy and a girl.
In France he had the opportunity of being assistant to flyer Louis Paulhan who gave him his interest in flying machines.
Enlisted at the 2nd Aviation Group as student pilot January 16, 1915, receiving Military pilot certificate n ° 925 obtained at the Etampes military aviation school, May 7, 1915.
A pilot of MF 1 squadron from June 1 to October 16, 1915 and promoted to Corporal, June 27, 1915, and Sergeant, September 7, 1915.
A pilot of MF 60 squadron from October 29 to December 3, 1915 and of F 35 squadron from December 4, 1915 to November 18, 1917.
Received the Cross of War and a Citation to the Order of the Army Corps in April 1916.
Appointed Warrant Officer, August 16, 1916 and received the Military Medal, August 20, 1916 with 2 citations to the order of the army, August 20, 1916 and August 27, 1916.
Hospitalized at Complementary Hospital No. 18 Toul July 21 to November 18, 1917.
Streak of aircrew, November 16, 1917 and Transferred to the 2nd Lyon-Bron aviation group of November 22, 1917.
Deleray Aircraft Works
Freeport NY.
USA
Built aircraft circa 1920.
Delda-S/A GmbH
1998:
Anderslebener Straβe 107-109
D-39387 Oschersleben
Germany
LSA builder as Delta Dart Flugzeugbau
de la Hault, Adhémar
Together with others, de la Hault founded the Aéro Club de Belgique in 1901.
Deicke
Deicke was quite prolific; he built 10 types from 1908 until 1933, when he introduced a “Volksflugzeug”, the Deicke ADM 11.
de Havilland Aeronautical Technical School
The de Havilland Aeronautical Technical School was founded in 1928, initially to provide owners of de Havilland Moth aircraft with technical maintenance skills and to enhance de Havilland’s apprenticeship scheme. From 1933, the students designed aircraft, and the best of these were built.
The Technical School was started at Edgware, London, England by Geoffrey de Havilland, founder of the de Havilland aircraft company, together with Frank Hearle. In 1934, the School moved to Hatfield, Hertfordshire, following the establishment of Hatfield Aerodrome there. The curriculum widened to cover the design, manufacture, and operation of aircraft in general. The instructors were engineers from the de Havilland company.
The drawings for the first one were done by a Dutch student, Juste van Hattum who entitled it the T.K.1, with T.K. for “Tekniese Kollege”. Three T.K. aircraft were built and flown, the T.K.1, the T.K.2, and the T.K.4. They did not receive DH style type numbers.
As school projects 4 aircraft were built by the students.
The de Havilland T.K. 1
The de Havilland T.K. 2
The de Havilland T.K. 4
The de Havilland T.K. 5
In 1940, the School was bombed by the Germans in a World War II raid and it was forced to move to Welwyn Garden City nearby. It then transferred to Salisbury Hall in 1941, now the location of the de Havilland Aircraft Heritage Centre. During 1947–48, the School was moved to Astwick Manor, to the northeast of Hatfield Aerodrome.
In 1963, the de Havilland company became part of Hawker Siddeley Aviation and the School was renamed to become the Hawker Siddeley Aviation (Hatfield) Apprentice Training School in 1965. Later it became part of Hatfield Polytechnic and then the College Lane campus of the University of Hertfordshire.
There were also associated schools at Broughton, Christchurch, Lostock, and Portsmouth.
de Havilland Canada
Formed in 1928 at Downsview, Toronto, as a constructional and service facility. Built 1,553 Tiger Moths (1938- 1945), erected about 40 D.H.60M Moths, a Giant Moth, some 25 Puss Moths, and 200 Tigers (from U.K.-built parts). Developed ski and float installations for DH products. Built 1,134 Mosquitoes (1942-1945) and 54 Fox Moths (postwar). Undertook design and construction of the Tiger Moth replacement, the DHC-1 Chipmunk, built in Canada, Britain, and Portugal. Further Canadian designs have concentrated on STOL capability: the DHC-2 Beaver transport, DHC-3 Otter transport, DHC-4 Caribou pistonengined freighter (company’s first
twin), DHC-5 Buffalo twin-turboprop freighter (first flown 1964), DHC-6 Twin Otter twin turboprop transport (first flown 1965), DHC-7 Dash 7 quiet STOL four-engined airliner (first flown 1975), and DHC-8 Dash 8Q short-range twin-turboprop regional airliner (first flown June 1983 and remaining in major production, with latest Series 400 for up to 78 passengers first flown January 1998). Special variants of its aircraft have included maritime surveillance, navigation training and airborne over-the-horizon telemetry relay models of the Dash 8. The company became part of the Hawker Siddeley Group in 1960, but retained the name de Havilland. From 1974 owned by Canadian Government, then Boeing (as Boeing Canada) from 1986.
In 1992 Bombardier purchased 51 percent of de Havilland Canada. In January 1997, they purchased the remaining 49 percent of DHC from the Province of Ontario, as part of Bombardier Aerospace Group in 1992 and since known as de Havilland Inc.
By 2007 Viking Air owned the rights to all early de Havilland Canada products from the Chipmunk through to Beaver, Otter, Caribou, Twin Otter and Dash 7.