Question: This builder of the Rutan Boomerang has this number of aircraft on display in the National Air and Space Museum?
Context: The Wide Field and Planetary Camera 2 (WFPC2) is a camera formerly installed on the Hubble Space Telescope.  The camera was built by the Jet Propulsion Laboratory and is roughly the size of a baby grand piano.  It was installed by servicing mission 1 (STS-61) in 1993, replacing the telescope's original Wide Field and Planetary Camera (WF/PC).  WFPC2 was used to image the Hubble Deep Field in 1995, the Hourglass Nebula and Egg Nebula in 1996, and the Hubble Deep Field South in 1998.  During STS-125, WFPC2 was removed and replaced with the Wide Field Camera 3 as part of the mission's first spacewalk on May 14, 2009.  After returning to Earth, the camera was displayed briefly at the National Air and Space Museum and the Jet Propulsion Laboratory before returning to its final home at the Smithsonian's National Air and Space Museum. Robert M. Stanley (August 19, 1912 – July 16, 1977) was an American test pilot and engineer.  He became the first American to fly a jet aircraft on October 2, 1942, as a civilian test pilot for Bell Aircraft.  He flew the Bell XP-59A Airacomet, which was the United States’ first turbojet aircraft.  The flight took place at Muroc Dry Lake, California.  The Airacomet is on display at the National Air and Space Museum in Washington, D.C. The List of aircraft in the Smithsonian Institution includes aircraft exhibited in the Smithsonian Institution's National Air and Space Museum, Steven F. Udvar-Hazy Center, and the Paul E. Garber Preservation, Restoration, and Storage Facility.  The Smithsonian Institution's collection of aircraft and spacecraft is the largest on display in the world. Giuseppe Mario Bellanca (March 19, 1886 – December 26, 1960) was an Italian-American airplane designer and builder who created the first enclosed-cabin monoplane in the United States in 1922.  This aircraft is now on display at the National Air and Space Museum's Steven F. Udvar-Hazy Center. The National Air and Space Museum of the Smithsonian Institution, also called the NASM, is a museum in Washington, D.C..  It holds the largest collection of historic aircraft and spacecraft in the world.  It was established in 1946 as the National Air Museum and opened its main building on the National Mall near L'Enfant Plaza in 1976.  In 2016, the museum saw approximately 7.5 million visitors, making it the second most visited museum in the world, and the most visited museum in the United States.  The museum contains the Apollo 11 command module, the "Friendship 7" capsule which was flown by John Glenn, Charles Lindbergh's "The Spirit of St. Louis", the Bell X-1 which broke the sound barrier, and the Wright brothers' plane near the entrance. The Gnome 7 Omega (commonly called the Gnome 50 hp) is a French seven-cylinder, air-cooled aero engine produced by Gnome et Rhône.  It was shown at the Paris Aero Salon held in December 1908 and was first flown in 1909.  It was the world's first aviation rotary engine produced in quantity.  Its introduction revolutionized the aviation industry and it was used by many early aircraft.  It produced 50 horsepower (37 kW) from its capacity of 8 litres (488 cubic inches).  A Gnome Omega engine powers the 1912 Blackburn Monoplane, owned and operated by the Shuttleworth Collection, the oldest known airworthy British-designed aeroplane worldwide.  A two-row version of the same engine was also produced, known as the Gnome 14 Omega-Omega or Gnome 100 hp.  The prototype Omega engine still exists, and is on display at the United States' National Air and Space Museum. The Faint Object Spectrograph (FOS) was a spectrograph installed on the Hubble Space Telescope.  It was replaced by the Space Telescope Imaging Spectrograph in 1997, and is now on display in the National Air and Space Museum in Washington DC. The National Air and Space Museum Film Archives, part of the Archives Division at the National Air and Space Museum, Smithsonian Institution, holds over 20,000 films documenting the history of aviation and space flight. He has designed 46 aircraft throughout his career, been the co-recipient of the Collier Trophy on two separate occasions, received six honorary doctoral degrees and has won over 100 different awards for aerospace design and development.  Rutan has five aircraft on display in the National Air and Space Museum in Washington, D.C., United States: SpaceShipOne, the Virgin Atlantic GlobalFlyer, Voyager, Quickie, and the VariEze. The Rutan Model 202 Boomerang is an aircraft designed and built by Burt Rutan .  The design was intended to be a multi-engine aircraft that in the event of failure of a single engine would not become dangerously difficult to control due to asymmetric thrust.  The result is an asymmetrical aircraft with a very distinct appearance.
Answer: five