Ruben Tatevosovich Yesayan (born November 24, 1946) is a Russian-Armenian test pilot.
 Yesayan tested several aircraft, including Tupolev Tu-334, Tupolev Tu-154, Ilyushin Il-76MF, Ilyushin Il-96 and Ilyushin Il-114, and received the title of the Hero of the Russian Federation.
The Ilyushin Il-96 (Russian: Илью́шин Ил-96 ) is a Russian four-engined long-haul wide-body airliner designed by Ilyushin in the former Soviet Union and manufactured by the Voronezh Aircraft Production Association in Voronezh, Russia.
 It is powered by four Aviadvigatel PS-90 two-shaft turbofan engines.
The Ilyushin Il-86 (Russian: Илью́шин Ил-86 ; NATO reporting name: Camber) is a short/medium-range wide-body jet airliner.
 It was the USSR's first wide-body and the world's second four-engined wide-body.
 Designed and tested by the Ilyushin design bureau in the 1970s, it was certified by the Soviet aircraft industry, manufactured and marketed by the USSR.
The Lockheed L-1011 TriStar, commonly referred to as the L-1011 (pronounced "L-ten-eleven") or TriStar, is a medium-to-long-range, wide-body trijet airliner by Lockheed Corporation.
 It was the third wide-body airliner to enter commercial operations, after the Boeing 747 and the McDonnell Douglas DC-10.
 The airliner has a seating capacity up to 400 passengers and a range over 4000 nmi .
 Its trijet configuration has three Rolls-Royce RB211 engines with one engine under each wing, and a third engine, center-mounted with an S-duct air inlet embedded in the tail and the upper fuselage.
 The aircraft has an autoland capability, an automated descent control system, and available lower deck galley and lounge facilities.
The Boeing 767 is a mid- to large-size, mid- to long-range, wide-body twin-engine jet airliner built by Boeing Commercial Airplanes.
 It was Boeing's first wide-body twinjet and its first airliner with a two-crew glass cockpit.
 The aircraft has two turbofan engines, a conventional tail, and, for reduced aerodynamic drag, a supercritical wing design.
 Designed as a smaller wide-body airliner than earlier aircraft such as the 747, the 767 has seating capacity for 181 to 375 people, and a design range of 3850 to , depending on variant.
 Development of the 767 occurred in tandem with a narrow-body twinjet, the 757, resulting in shared design features which allow pilots to obtain a common type rating to operate both aircraft.
The Ilyushin Il-18 was a Soviet four-engined airliner designed and built by Ilyushin immediately after World War II.
 Although the aircraft itself was successful, its Shvetsov ASh-73TK engines were too unreliable for civilian use and were further needed to equip the Tupolev Tu-4 bomber, so it was cancelled in 1948.
The Vickers VC10 is a mid-sized, narrow-body long-range British airliner designed and built by Vickers-Armstrongs (Aircraft) Ltd and first flown at Brooklands, Surrey, in 1962.
 The airliner was designed to operate on long-distance routes from the shorter runways of the era and commanded excellent hot and high performance for operations from African airports.
 The performance of the VC10 was such that it achieved the fastest crossing of the Atlantic by a jet airliner, a record still held to date for a sub-sonic airliner, of 5 hours and 1 minute; only the supersonic Concorde was faster.
 The VC10 is often compared to the larger Soviet Ilyushin Il-62, the two types being the only airliners to use a rear-engined quad layout; the smaller business jet Lockheed JetStar also had this engine arrangement.
The Boeing 777 is a long-range wide-body twin-engine jet airliner designed and manufactured by Boeing Commercial Airplanes, the commercial business unit of Boeing.
 Commonly referred to as "Triple Seven", it is the largest twinjet and the world's longest-range airliner.
 The 777 can accommodate between 301 and 365 passengers in a three-class layout, and has a range of 5235 to , depending on the model.
 Developed in consultation with eight major airlines, the 777 was designed to replace older wide-body airliners and bridge the capacity difference between the 767 and 747.
Belgorod International Airport (Russian: Международный Аэропорт Белгород ) (IATA: EGO, ICAO: UUOB) is an airport in Russia located 4 km north of Belgorod.
 It services narrow-body airliners (such as the Tupolev Tu-154, Tupolev Tu-204, Ilyushin Il-76, Boeing 737, Airbus A320, Boeing 757 etc.) and wide-body airliner Boeing 767.
 It conducts 24-hour flight operations.
 The airport was founded in 1954.
The Fokker F.XXXVI was a 1930s Dutch four-engined 32-passenger airliner designed and built by Fokker.
 It was the largest transport designed and built by Fokker.

Question: Ruben Tatevosovich Yesayan tested what Russian four-engined long-haul wide-body airliner designed by Ilyushin?
Answer: Ilyushin Il-96