Question: How many separate models of the aircraft flown by the Flotille 17F were manufactured?
Context: Flottille 17F is a squadron of French Naval Aviation which currently flies the Dassault Rafale M from Landivisiau Naval Air Base.  It was formed during April 1958 at Hyeres Naval Air Base and flew the Vought F4U7 Corsair for training purposes. The Vought F4U Corsair is an American fighter aircraft that saw service primarily in World War II and the Korean War.  Demand for the aircraft soon overwhelmed Vought's manufacturing capability, resulting in production by Goodyear and Brewster: Goodyear-built Corsairs were designated FG and Brewster-built aircraft F3A.  From the first prototype delivery to the U.S. Navy in 1940, to final delivery in 1953 to the French, 12,571 F4U Corsairs were manufactured, in 16 separate models, in the longest production run of any piston-engined fighter in U.S. history (1942–53). The OpenSky M-02/M-02j is a Japanese primary glider/jet-powered motor glider inspired by the "Möwe" aircraft flown by the protagonist in the Hayao Miyazaki anime "Nausicaä of the Valley of the Wind".  It is a tail-less design intended to be powered on take off and climb for a duration of 10 minutes, then flown unpowered as a glider.  As of June 2006, two aircraft prototypes have been constructed, and one has successfully completed a series of 10 unpowered test flights where it flew 98 meters and achieved an altitude of 4 meters after being tow-launched by a tensed elastic cable.  The project is led by artist Kazuhiko Hachiya and design by Satoru Shinohe and manufactured by Aircraft Olympos.  The Jet engine installed version, M-02J, had public demonstration flight in June 2016 at Takikawa, Hokkaido. The Ellehammer Semi-biplane was a pioneering aircraft flown in Denmark in 1906.  Jacob Ellehammer built the aircraft based on his monoplane design of the previous year.  Like that aircraft, it featured a large, triangular wing, with a motor (of Ellehammer's own design and construction) mounted beneath it.  The pilot sat on a seat that was suspended like a pendulum, allowing him to shift his weight to control the aircraft, similar in concept (if not execution) to the control of a modern hang-glider.  Unlike his monoplane, however, the semi-biplane's main wing formed a constant, unbroken span.  Additionally, it was fitted with an upper wing of the same triangular shape, which connected to the main wing at its three corners and to an arch above the aircraft's centreline. The Dedalus Poppy is a homebuilt, single engine, single seat ultralight aircraft flown in Italy in the 1980s.  Several were built and flown; at least one remains on the Italian civil register in 2010. The Bloch MB.170 and its family of derivatives were French reconnaissance bombers designed and built shortly before World War II.  They were the best aircraft of this type available to the "Armée de l'Air" at the outbreak of the war, with speed and maneuverability that allowed them to evade interception by the German fighters of the time.  Although the aircraft could have been in service by 1937, debate over what role to give the aircraft delayed deliveries until 1940.  Too few in number to make any measurable impact on the Battle of France, they continued in service with the Vichy forces after the armistice.  The MB.174 is notable as the aircraft flown by Antoine de Saint-Exupéry, author of "The Little Prince" during the campaign.  His work "Pilote de Guerre" - translated as "Flight to Arras" and published in 1942 - is based on a 1940 reconnaissance mission in this type of aircraft. In statistics, the reference class problem is the problem of deciding what class to use when calculating the probability applicable to a particular case.  For example, to estimate the probability of an aircraft crashing, one might use the frequency of crashes of all aircraft, of this make of aircraft, of aircraft flown by this company in the last ten years, etc.  Any case is a member of very many classes, in which the frequency of the attribute of interest (such as crashing) differs, and the reference class problem discusses which is the most appropriate to use. The Nieuport 28 C.1 was a French biplane fighter aircraft flown during World War I, built by Nieuport and designed by Gustave Delage.  Owing its lineage to the successful line of sesquiplane fighters that included the Nieuport 17, the Nieuport 28 continued a similar design philosophy of a lightweight and highly maneuverable aircraft. The US Federal Aviation Administration has adopted the name "unmanned aircraft" (UA) to describe aircraft systems without a flight crew on board.  More common names include "UAV", "drone", "remotely piloted vehicle" ("RPV"), "remotely piloted aircraft" ("RPA"), and "remotely operated aircraft" ("ROA").  These "limited-size" (as defined by the "Fédération Aéronautique Internationale") unmanned aircraft flown in the USA's National Airspace System, flown solely for recreation and sport purposes, such as models, are generally flown under the voluntary safety standards of the Academy of Model Aeronautics, the United States' national aeromodeling organization.  To operate a UA for non-recreational purposes in the United States, according to the FAA users must obtain a "Certificate of Authorization" (COA) to operate in national airspace.  In December 2015 the FAA announced that all UAVs weighing more than 250 grams flown for any purpose must be registered with the FAA. New York State Route 17F (NY 17F) was a state highway located in the Southern Tier of New York in the United States.  The western terminus of the route was at then-NY 17 (now NY 417) in Andover, Allegany County.  The eastern terminus was at NY 17 (current NY 417) in Addison, Steuben County.  NY 17F was an alternate to NY 17 between the two locations, branching north to serve Almond, Hornell, and Canisteo.
Answer: 16