The widebody Airbus A340-600, like the ‘flying pencil’ narrowbody Boeing 757, was noted and loved by enthusiasts for its elongated shape. With Lufthansa finally bedding down the last of its fleet, the type has come to an end with its original operators. Its retirement is shadowed by the remaining commercial passenger A340-300s also heading for retirement.
With that being said, an epilogue for both aircraft awaits in Iran. The A340-600 was built with a long fuselage as it had to compete with the wider and double-decked Boeing 747-400. Lacking width and height, length was the sole dimension left to Airbus engineers.
The echoes continue today. While Airbus has not published the probable length of the stretched A350-2000 it is known to be seriously considering, it is reasonable to assume it will be around 260 feet (80 meters long). If built, it would likely be over 10 feet (four meters) longer than the A340-600 was.
Why Airbus Built The A340
The Airbus A330 and A340 series of widebody aircraft are among the greatest successes in Airbus’ history and helped establish the airline as one of the two primary airliner makers today. The two aircraft are closely related, with the A340 series coming with four engines, as it was built at a time when ETOPS remained in its infancy. While Airbus built 377 examples of the A340, it was the twin-engined A330 that proved more successful and was eventually upgraded to the A330neo.
The A340 series included the A340-200, A340-300, A340-400, and A340-600 variants. It was built to replace early-generation Boeing 747-200/-300 airliners and was able to carry 379 passengers in a three-class cabin. It boasted a range of 7,500 nautical miles, giving it the range to connect long-haul routes, while its four-engine design allowed it to avoid aircraft diversion requirements.
Over time, however, the increasing ETOPS for twin-engined jets and improving engines made the quad-engine design a burden. The type struggled to compete with twin jets. A total of 97 A340-600s were built and delivered between 2002 and 2010. For comparison, 28 A340-200s, 218 A340-300s, and 34 A340-500s were built.
Longer Than Early Boeing 747s
The A340-600 was built as a single-deck quad-engine replacement for early 747s. The easiest way for Airbus to add capacity, without adding an upper deck or making the aircraft wider, was to make the fuselage longer. Airbus built the A340-600 to be 247 feet and three inches (75.36 m) long, which is considerably longer than 747s before the 747-8. The 747-100, 747-200, 747-300, and 747-400 were all 231 feet and ten inches (70.66 meters) long.
This makes the -600 around 15 feet (five meters) longer than the 747. The final 747-8 variant was longer at 250 feet and two inches (76.25 meters). The A340-600 was also considerably longer than the other A340 variants. The A340-200 measured 194 feet and ten inches (59.39 meters), the A340-300 208 feet and 11 inches (63.69 meters), and the A340-500 extended 222 feet and ten inches (67.93 meters).
Measurements of A340-600 vs Boeing 747s (Per Airbus & Boeing) | A340-600 | Boeing 747-100 | Boeing 747-400 |
|---|---|---|---|
Approximate cabin length | 200 feet (61.0 meters) | 185 feet (56.4 meters) | 187 feet (57.0 meters) |
Maximum cabin width | 17 feet 4 inches (5.28 meters) | 20 feet (6.1 meters) | 20 feet (6.1 meters) |
Approximate rectangular floor area | 3,466 sq ft (322 m²) | 3,703 sq ft (344 m²) | 3,746 sq ft (348 m²) |
Overall length of aircraft | 247 feet and three inches (75.36 meters) | 231 feet and ten inches (70.66 meters) | 231 feet and ten inches (70.66 meters) |
However, the more consequential measure is not the distance of the nose to the tail; it’s the usable cabin length. The A340-600 comes with around 200 feet (61.0 meters) of passenger cabin length. The Boeing 747-100’s main deck measured 185–187 feet (56.4-57.0 meters). This means that its usable cabin space was modestly less than its overall comparative length would suggest.
Boeing 747-400s Were Already Aging As The A340-600 Took Flight
The A340-600 was designed to carry around 380 passengers in a typical three-class configuration. Interestingly, this was broadly comparable to the capacity of some early 747 configurations, even though the 747 was considerably wider. The 747’s extra width allowed it to seat ten abreast (3-4-3) in economy on the main deck, while the A340’s narrower fuselage only accommodated nine (3-3-3).
Unlike the massive A380, the 747’s upper deck was comparatively narrow. Over time, Boeing significantly expanded the 747’s upper deck.
Airbus launched the A340-600 in December 1997, with the aircraft having its maiden flight in 2001 and entering service with Virgin Atlantic in 2002. The Boeing 747-400 was announced in 1984, had its maiden flight in 1988, and entered service in 1989.
This meant they were in production at the same time, but the 747-400 was already an aging aircraft. The final passenger 747-400 was delivered in 2005. Creating a replacement for the 747-100, 747-200, and 747-300 and a competitor for the 747-400, Airbus stretched the A340-300, fitted it with large wings, and strapped on more powerful engines.
It also added an extra set of landing gear. The A340-600 traded some range for extra space, and Airbus elected to preserve the quad-engine design. By this stage, the market was already moving against quadjets. The last major new-build four-engine aircraft order by a US passenger airline was made by Northwest Airlines in 1985 for Boeing 747-400s.
HOW MANY ARE FLYING?
Pick an aircraft to see how many are in the air right now
A340-600 Outperformed On Cargo & Fuel Efficiency
The A340-600 could come close to matching the passenger capacity of older 747s, but still fell short of the 747-400 and its lengthened upper deck. The 747-400 had a typical three-seat capacity of 416 passengers, around 36 more than the A340-600. A 2010 study showed that, in practice, the airline average was 369 seats for the 747-400 and 302 for the A340-600.
In terms of range, the -600 had a longer published range at around 7,500 nautical miles compared with the Boeing 747-400’s 7,200 to 7,300 nautical miles. The hefty 747-400 had a considerably higher maximum structural payload at 75 tonnes compared with 61 tonnes. That gave it a 23% advantage. However, there is an important nuance, as the A340-600 comes with a particularly capable belly hold.
Published belly cargo volume figures are 6,132 cubic feet (174 m³) for the A340-600 and just 5,332–6,025 cubic feet (151–171 m³) for the 747. This gave it more cargo space than the 747-400. As a newer-generation aircraft, the A340-600 boasted better fuel efficiency for the missions it was targeting. The important factor is not so much how much these airliners burn in total, but how much that is per seat.
The Boeing 747-400 generally remained marginally more efficient per seat on shorter routes, while the A340-600 was substantially better on ultra-long haul routes. On the Dubai to LAX route, the 747-400 was estimated to consume around 62% more fuel per seat. This was partly due to the -400 being unable to carry a full complement of passengers on ultra-long-haul routes.
A Nuanced Failure
With fewer than 100 examples sold, the A340-600 cannot be considered an unqualified success. When it arrived, it was already a legacy of the past, with the industry turning away from quads. This was a painful lesson that the Boeing 747-8 and especially the Airbus A380 would go on to learn.
Still, the elongated aircraft won over a fanbase of aviation enthusiasts, and the overall A340 family is now seen as an essential part of Airbus’s development into a world player. In October 2026, CNN summarized the situation, saying that:
“For most of the three decades it’s been flying, the Airbus A340-600 has been seen as a commercial flop: an uneconomical aircraft that was bettered by rivals soon after its launch. Its four engines were thirsty, its record-breaking length required special runway clearance, and its quirky design gave it a reputation for eyebrow-raising inflight activities.“
Today, it is being replaced by aircraft like the A350-1000 and the long-delayed Boeing 777-9. The final A340-600 aircraft Lufthansa retired were delivered in 2008 and 2009, making them around 17 years old by retirement. This is poor for a modern widebody. They should otherwise be considered only around mid-age. At least it’s better than Air France’s A380s, which retired at as little as six years old.
The A340-600’s Iranian Epilogue
The Airbus A340-600 was the longest airliner when it entered service, a record that it would lose to the unpopular final Boeing 747-8 variant. One note on the Boeing 747-8 is that it was reasonably successful as a freighter and special mission/VIP jet, but sold very poorly as a passenger aircraft.
Only 36 examples of the passenger aircraft were sold as scheduled airliners to only three airlines (Lufthansa, Korean Air, and Air China). Lufthansa seemed to be everything US-based airlines were not in this period, at least with regard to quads. Lufthansa would go on to purchase every quad-engined aircraft (747-400, A340-200/-300/-600, Boeing 747-8, A380).
Meanwhile, US carriers purchased nothing past the 747-400 ordered before the A340-600 was conceived. Most US airlines didn’t even purchase the passenger 747-400. American Airlines, US Airways, and Delta didn’t ( Delta inherited them from Northwest). Today, the A340-600 is aging, and its time is coming to an end. Lufthansa and others are phasing them out. Lufthansa withdrew the last five of its A340-600s in 2026, including five in October.
These are currently listed by Planespotters.net as stored. However, the end is not necessarily the end. One recurring theme for the A340 family is that they find their way post-retirement to Iran via shell companies to avoid sanctions. Once in Iran, legacy aircraft have a history of clinging on much longer than they otherwise would. Eight A340-600s are now known to be in Iran’s Mahan Air inventory.
