Question: Extended Operations (ETOPS) refers to the standards and recommended practices for aircraft including which wide-body twin-engine jet airliner that can typically seat 266 passengers?

Context articles: List of Boeing 777 operators
Boeing 757
Boeing 777
Airbus A300
International Aviation Safety Assessment Program
Wide-body aircraft
Boeing 767
Airbus A330
ETOPS
List of Airbus A330 operators

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.
The Boeing 757 is a mid-size, narrow-body twin-engine jet airliner that was designed and built by Boeing Commercial Airplanes.
 It is the manufacturer's largest single-aisle passenger aircraft and was produced from 1981 to 2004.
 The twinjet has a two-crew member glass cockpit, turbofan engines of sufficient power to allow takeoffs from relatively short runways and higher altitudes, a conventional tail and, for reduced aerodynamic drag, a supercritical wing design.
 Intended to replace the smaller three-engine 727 on short and medium routes, the 757 can carry 200 to 295 passengers for a maximum of 3150 to , depending on variant.
 The 757 was designed concurrently with a wide-body twinjet, the 767, and owing to shared features pilots can obtain a common type rating that allows them to operate both aircraft.
The Boeing 777 is a family of long-range wide-body twin-engine jet airliners developed and manufactured by Boeing Commercial Airplanes.
 It is the world's largest twinjet and has a typical seating capacity of 314 to 396 passengers, with a range of 5240 to .
 Commonly referred to as the "Triple Seven", its distinguishing features include the largest-diameter turbofan engines of any aircraft, six wheels on each main landing gear, fully circular fuselage cross-section, and a blade-shaped tail cone.
 Developed in consultation with eight major airlines, the 777 was designed to replace older wide-body airliners and bridge the capacity difference between Boeing's 767 and 747.
 As Boeing's first fly-by-wire airliner, it has computer-mediated controls.
 It was also the first commercial aircraft to be designed entirely with computer-aided design.
The Airbus A300 is a wide-body twin-engine jet airliner that was developed and manufactured by Airbus.
 Formally announced in 1969 and first flying in October 1972, it holds the distinction of being the world's first twin-engined widebody airliner; it was also the first product of Airbus Industrie, a consortium of European aerospace manufacturers, now a subsidiary of Airbus.
 The A300 can typically seat 266 passengers in a two-class layout, with a maximum range of 4070 nmi when fully loaded, depending on model.
The International Aviation Safety Assessment Program (IASA Program) is a program established by the U.S. Federal Aviation Administration in 1992.
 The program is an attempt to appreciate a country's ability to adhere to standards and recommended practices for aircraft operations and maintenance.
 The regulatory authorities in any sovereign country are obliged under the Chicago Convention to exercise regulatory oversight over air carriers within the state.
 Such international standards and recommended practices are laid down by the United Nations' technical agency for aviation, the International Civil Aviation Organization (ICAO).
A wide-body aircraft is a jet airliner having a fuselage wide enough to accommodate two passenger aisles, also known as twin-aisle aircraft, with seven or more seats abreast.
 The typical fuselage diameter is 5 to .
 In the typical wide-body economy cabin, passengers are seated seven to ten abreast, allowing a total capacity of 200 to 850 passengers.
 The largest wide-body aircraft are over 6 m wide, and can accommodate up to eleven passengers abreast in high-density configurations.
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 Airbus A330 is a medium- to long-range wide-body twin-engine jet airliner made by Airbus.
 Versions of the A330 have a range of 5000 to and can accommodate up to 335 passengers in a two-class layout or carry 70 t of cargo.
ETOPS is an aviation acronym for Extended Operations.
 The term used to signify "Extended Range Operation with Two-Engine Airplanes" but the meaning was changed by the US Federal Aviation Administration (FAA) when regulations were broadened to include aircraft with more than two engines.
 It refers to the standards and recommended practices (SARPS) issued by ICAO for aircraft (such as the Airbus A300, A310, A320, A330 and A350, the Boeing 737, 757, 767, 777, 787, the Embraer E-Jets, and the ATR 72) to fly long-distance routes that had been off-limits to twin-engined aircraft, and subsequently to extended range operations of four-engined aircraft (such as the Boeing 747-8 Intercontinental).
The Airbus A330 is a wide-body twin-engine jet airliner made by Airbus.
 Versions of the A330 have a range of 7400 to and can accommodate up to 335 passengers in a two-class layout or carry 70 t of cargo.