An aerostat (From Greek ἀήρ "aer" (air) + στατός "statos" (standing) through French) is a lighter than air craft that gains its lift through the use of a buoyant gas.
 Aerostats include unpowered balloons and powered airships.
 A balloon may be free-flying or tethered.
 The average density of the craft is lower than the density of atmospheric air, because its main component is one or more gasbags, a lightweight skin containing a lifting gas to provide buoyancy, to which other components such as a gondola containing equipment or people are attached.
 Especially with airships, the gasbags are often protected by an outer envelope.
The Stevens Model 520 was a pump-action shotgun developed by John Browning and originally manufactured by the J Stevens Arms & Tool Company between 1909 and 1916.
 Stevens was sold to New England Westinghouse on 28 May 1915 and production of civilian firearms was greatly reduced.
 The company was renamed the "J Stevens Arms Company" on 1 July 1916 and New England Westinghouse used their manufacturing facility in Chicopee Falls, MA to produce Mosin-Nagant rifles under contract for the Russian Czar during World War I.
 After the war, Stevens was sold to Savage Arms on 1 April 1920 and full production of civilian firearms resumed.
 Under Savage ownership, Model 520 production continued until 1939 when it was replaced by the Model 520A which ended production in 1948.
 Stevens also further modified the design when they introduced the streamlined Model 620 in 1927.
 The Model 620 was internally similar to the Model 520 and was produced until 1939 when it was replaced by the Model 620A which ended production in 1955.
 This shotgun is a hammerless, pump action, take-down design with a tubular magazine which holds 5 shells.
 All models can also be slam fired: the shotgun has no trigger disconnector and shells can be fired one after the other simply by working the slide if the trigger is held down.
The Boeing E-3 Sentry, commonly known as AWACS, is an American airborne early warning and control (AEW&C) aircraft developed by Boeing as the prime contractor.
 Derived from the Boeing 707, it provides all-weather surveillance, command, control, and communications, and is used by the United States Air Force, NATO, Royal Air Force, French Air Force, and Royal Saudi Air Force.
 The E-3 is distinguished by the distinctive rotating radar dome above the fuselage.
 Production ended in 1992 after 68 aircraft had been built.
Japan Air Lines flight 1628 was a UFO incident that occurred on November 17, 1986 involving a Japanese Boeing 747 cargo aircraft.
 The aircraft was en route from Paris to Narita International Airport, near Tokyo, with a cargo of Beaujolais wine.
 On the Reykjavík to Anchorage section of the flight, at 17:11 over eastern Alaska, the crew first witnessed two unidentified objects to their left.
 These abruptly rose from below and closed in to escort their aircraft.
 Each had two rectangular arrays of what appeared to be glowing nozzles or thrusters, though their bodies remained obscured by darkness.
 When closest, the aircraft's cabin was lit up and the captain could feel their heat on his face.
 These two craft departed before a third, much larger disk-shaped object started trailing them, causing the pilots to request a change of course.
 Anchorage Air Traffic Control obliged and requested an oncoming United Airlines flight to confirm the unidentified traffic, but when it and a military craft sighted JAL 1628 at about 17:51, no other craft could be distinguished.
 The sighting of 50 minutes ended in the vicinity of Denali (formerly Mount McKinley).
The Abrams Air Craft Corporation was an aircraft manufacturer established in Lansing, Michigan in 1937 as an offshoot of Talbert Abrams' Aerial Survey Corporation.
 Abrams had founded an airline (ABC Airline) in 1929 but found himself increasingly interested in aerial photography.
The Boeing C-137 Stratoliner was a VIP transport aircraft derived from the Boeing 707 jet airliner used by the United States Air Force.
 Other nations also bought both new and used 707s for military service, primarily as VIP or tanker transports.
 In addition, the 707 served as the basis for several specialized versions, such as the E-3 Sentry AWACS aircraft.
 The designation C-18 covers several later variants based on the 707-320B/C series.
The Boeing Model 307 Stratoliner was the first commercial transport aircraft to enter service with a pressurized cabin.
 This feature allowed the aircraft to cruise at an altitude of 20,000 ft (6,000 m), well above many weather disturbances.
 The pressure differential was 2.5 psi (17 kPa), so at 14,700 ft (4,480 m) the cabin air pressure was equivalent to an altitude of 8,000 ft (2,440 m).
 The Model 307 had capacity for a crew of six and 33 passengers.
 The cabin was nearly 12 ft (3.6 m) across.
 It was the first land-based aircraft to include a flight engineer as a crew member (several flying boats had included a flight engineer position earlier).
 In addition to its civilian service it was also flown as the Boeing C-75 Stratoliner by the United States Army Air Forces, who used it as a long-range cargolift aircraft.
The ACME Anser was an amphibious twin-jet utility aircraft that was developed in the United States by Air Craft Marine Engineering in 1958.
 Its name was a contraction of Analytic Services, a company that contributed to the design.
 The project was cancelled before the prototype was complete.
The Air Craft Marine Engineering Company (ACME) was a short-lived aircraft manufacturer based in Van Nuys, California.
 It was established in 1954 to develop an amphibious utility aircraft, the ACME Anser.
General aviation in the United Kingdom has been defined as a civil aircraft operation other than a commercial air transport flight operating to a schedule or military aviation.
 Although the International Civil Aviation Organization (ICAO) excludes any form of remunerated aviation from its definition, some commercial operations are often included within the scope of general aviation (GA) in the UK.
 The sector operates business jets, rotorcraft, piston and jet-engined fixed-wing aircraft, gliders of all descriptions, and lighter than air craft.
 Public transport operations include business (or corporate) aviation and air taxi services, and account for nearly half of the economic contribution made by the sector.
 Other commercial GA activities are aerial work, such as surveying and air ambulances, and flight training, which plays an important role in the supply of pilots to the commercial air transport (CAT) industry.
 Private flying is conducted for personal transport and recreation.
 It includes a strong vintage aircraft movement, and encompasses a range of air sports, such as racing, aerobatics, and parachuting, at which British teams and individuals have succeeded in international competition.

Question: What air craft ended production in 1992 and was derived from the same aircraft as the Boeing C-137 Stratoliner?
Answer: Boeing E-3 Sentry