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Sound of jet airliner overhead

The sound of a jet airliner passing overhead (starts at about 20 seconds)

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Ajet airliner orjetliner is anairliner powered byjet engines (passengerjet aircraft). Airliners usually havetwo orfour jet engines;three-engined designs were popular in the 1970s but are less common today. Airliners are commonly classified as either the largewide-body aircraft, mediumnarrow-body aircraft and smallerregional jet.

Most airliners today are powered by jet engines, because they are capable of safely operating at high speeds and generate sufficient thrust to power large-capacity aircraft. The first jetliners, introduced in the 1950s, used the simplerturbojet engine; these were quickly supplanted by designs usingturbofans, which are quieter and more fuel-efficient.

The first airliners with turbojet propulsion were experimental conversions of theAvro Lancastrian piston-engined airliner, which were flown with several types of early jet engine, including thede Havilland Ghost and theRolls-Royce Nene. They retained the two inboard piston engines, the jets being housed in the outboard nacelles. The first airliner with jet power only was the Nene-poweredVickers VC.1 VikingG-AJPH, which first flew on 6 April 1948.

The early jet airliners had much lower interior levels of noise and vibration than contemporary piston-engined aircraft, so much so that in 1947, after piloting a jet powered aircraft for the first time, Wing Commander Maurice A. Smith, editor ofFlight magazine, said, "Piloting a jet aircraft has confirmed one opinion I had formed after flying as a passenger in the Lancastrian jet test beds, that few, if any, having flown in a jet-propelled transport, will wish to revert to the noise, vibration and attendant fatigue of an airscrew-propelled piston-engined aircraft"^[1]

The first purpose-built jet airliner was the Britishde Havilland Comet which first flew in 1949 and entered service in 1952 withBOAC. It carried 36 passengers up to 2500 miles (4000 km) at a speed of 450mph (725 km/h). Serious structural problems arose not even two years after entering service and prompted several changes in design. The last original Comet was retrofitted in 1958.^[2] Also developed in 1949 was theAvro Canada C102 Jetliner, which never reached production;^{[citation needed]} however, the termjetliner came into use as a generic term for passenger jet aircraft.

These first jet airliners were followed some years later by theSud Aviation Caravelle from France, theTupolev Tu-104 from the Soviet Union (2nd in service), and theBoeing 707,Douglas DC-8 andConvair 880 from the United States. National prestige was attached to developing prototypes and bringing these early designs into service. There was also a strongnationalism in purchasing policy, so that USBoeing andDouglas aircraft became closely associated withPan Am, whileBOAC ordered British Comets.

Pan Am and BOAC, with the help ofadvertising agencies and their strong nautical traditions ofcommand hierarchy andchain of command (retained from their days of operatingflying boats), were quick to link the "speed of jets" with the safety and security of the "luxury ofocean liners" in thepublic'sperception.

Aeroflot used SovietTupolevs, whileAir France introduced FrenchCaravelles. Commercial realities dictated exceptions, however, as few airlines could risk missing out on a superior product:American Airlines ordered the pioneering Comet (but later cancelled when the Comet ran intometal fatigue problems), Canadian, British and European airlines could not ignore the better operating economics of the Boeing 707 and the DC-8, while some American airlines ordered the Caravelle.

Boeing became the most successful of the early manufacturers. TheKC-135 Stratotanker and military versions of the 707 remain operational, mostly astankers orfreighters. The basic configuration of the Boeing,Convair and Douglas aircraft jet airliner designs, with widely spaced podded engines underslung on pylons beneath a swept wing, proved to be the most common arrangement and was most easily compatible with the large-diameter high-bypass turbofan engines that subsequently prevailed for reasons of quietness andfuel efficiency.

ThePratt & Whitney JT3 turbojets powered the original Boeing 707 and DC-8 models; in the early 1960s the JT3 was modified into the JT3D low-bypass turbofan for long-range 707 and DC-8 variants.^[3]

Thede Havilland andTupolev designs had engines incorporated within the wings next to thefuselage, a concept that endured only within military designs while the Caravelle pioneered engines mounted either side of the rear fuselage.

The 1960s jet airliners include theBAC One-Eleven andDouglas DC-9twinjets;Boeing 727,Hawker Siddeley Trident andTupolev Tu-154trijets; and the paired multi-enginedIlyushin Il-62, andVickers VC10.^[4] The world-renownedsupersonicConcorde first flew in 1969 but proved to be an economical disaster. Only 14 ever entered service, and the last Concorde was retired in 2003.^[5]

The 1960s jet airliners were known for the advancement of the more economicalturbofan technology, which passes air around the engine core instead of through it.^[5] Jet airliners that entered service in the 1960s were powered by slim,low-bypass turbofan engines, many aircraft used the rear-engined,T-tail configuration, such as theBAC One-Eleven,Boeing 737, andDouglas DC-9twinjets;Boeing 727,Hawker Siddeley Trident,Tupolev Tu-154trijets; and the paired multi-enginedIlyushin Il-62, andVickers VC10. The rear-engined T-tail arrangement is still used for jetliners with amaximum takeoff weight of less than 50 tons.^[4]

As of April 2023, 15,591 Boeing 737s have been ordered and 11,395 delivered, and it remains the most produced jet aircraft.

Other 1960s developments, such as rocket-assisted takeoff (RATO),water-injection, andafterburners (also known as reheat) used onsupersonic jetliners (SSTs) such asConcorde and theTupolev Tu-144, have been superseded.

The 1970s jet airliners introducedwide-body (twin-aisle) craft andhigh-bypass turbofan engines.^[6] Pan Am and Boeing "again opened a new era in commercial aviation" when the firstBoeing 747 entered service in January 1970, marking the debut of the high-bypass turbofan which lowered operating costs,^[7] and the initial models which could seat up to 400 passengers earned it the nickname "Jumbo Jet". The Boeing 747 revolutionized air travel by making commercial air travel more affordable as ticket prices fell and airlines improved their pricing practices.^[5] Other wide-body designs included theMcDonnell Douglas DC-10 andLockheed L-1011 TriStartrijets, smaller than the Boeing 747 but capable of flying similar long-range routes from airports with shorter runways. There was also the market debut of the European consortiumAirbus, whose first aircraft was thetwinjetAirbus A300.^[8]

In 1978,Boeing unveiled the twin-engineBoeing 757 to replace its727, and the wide body twin-engine767 to challenge theAirbus A300.^[9][10][11] The mid-size 757 and 767 launched to market success, due in part to 1980s extended-range twin-engine operational performance standards (ETOPS) regulations governing transoceanic twinjet operations.^[12] These regulations allowed twin-engine airliners to make ocean crossings at up to three hours' distance from emergencydiversionary airports.^[13] Under ETOPS rules, airlines began operating the 767 on long-distance overseas routes that did not require the capacity of larger airliners.^[12][14][15]

By the late 1980s, DC-10 and L-1011 models were approaching retirement age, prompting manufacturers to develop replacement designs.^[16] McDonnell Douglas started working on theMD-11, a stretched and upgraded successor of the DC-10.^[16] Airbus, thanks to the success of itsA320 family, developed the medium-rangeA330 twinjet and the related long-rangeA340 quad-jet.^[16] In 1988, Boeing began developing what would be the777 twinjet,^[17] using the twin-engine configuration given past design successes, projected engine developments, and reduced-cost benefits.^[18][19] In addition, Boeing also released a major update on their 747, the747-400.

The most modern airliners are characterized by increased use of composite materials, high-bypass ratio turbofan engines, and more advanced digital flight systems. Examples of the latest widebody airliners are theAirbus A380 (first flight in 2005),Boeing 787 (first flight in 2009) andAirbus A350 (first flight in 2013). These improvements allowed longer ranges and lower cost of transportation per passenger.Sukhoi Superjet 100 andAirbus A220 (formerly Bombardier CSeries) are examples of narrowbodies with similar level of technological advancements.

The A380 was discontinued in 2019 and the last plane was delivered toEmirates in 2021. Airbus began designing it in the 90s with the expectation that airlines would be moving many people between large hubs with just one flight. Their focus was on building a very large plane with a conventional metal airframe and engines to supersede theBoeing 747. However, airlines started to operate more direct, point-to-point flights between smaller cities which made twin engine jets more attractive and economical to operate.^[20] For comparison, Boeing took a different approach and started development of the 787 in 2003 with a newcomposite frame and more fuel-efficient engines. This would prove to be the smarter choice as the lighter airframe paired with two next generation engines (Trent 1000 andGEnx) was much less costly to operate then the quad engine A380. The final blow to the A380 program came when Emirates cancelled a major order in 2018 and left Airbus without enough demand to continue production. It cancelled the program after realizing it would never recoup the €25 billon ($30 billion) spent onresearch and development.^[21] In all, 251 A380s were produced for and flown by 14 airlines.^[22] As of June 2023,Boeing has produced 1,054 787s for 34 airlines and has 592 unfulfilled orders.^[23]

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