How do the largest Boeing aircraft compare in size?

The Boeing 747-8 is the heaviest Boeing production aircraft, with a 447.7-tonne maximum take-off weight. The 777-9 is slightly longer and has a wider wingspan with its folding tips extended, but it is much lighter. For cargo volume, the bulbous 747 Dreamlifter is exceptional, although the 747-8F carries more payload.

For this Aviation & Real-World Flying comparison, “largest” needs a defined measurement: length, wingspan, maximum take-off weight, passenger capacity or cargo volume. Our overview of how Boeing's main commercial families fit together covers the smaller models and their roles.

Largest Boeing aircraft size comparison

By published dimensions, the 777-9 is Boeing's longest aircraft and has the widest extended wingspan, while the 747-8 has the highest maximum take-off weight.

These figures are rounded planning values. Exact weights can differ by certified weight option and sub-variant, so maximum take-off weight should not be treated as the aircraft's weight on every flight.

Is the Boeing 777-9 bigger than the 747-8?

The 777-9 is longer and has a wider airborne wingspan, but the 747-8 is substantially heavier and has the larger double-deck fuselage.

• Length: the 777-9 is approximately 0.5 metres longer than the 747-8.
• Wingspan: its extended span is roughly 3.4 metres wider. On the ground, the tips fold to reduce the span to about 64.8 metres.
• Weight: the 747-8's maximum take-off weight is about 96 tonnes greater.
• Cabin arrangement: the 777-9 uses one long passenger deck, whereas the 747-8I has a main deck and a shorter upper deck.

The folding tips help the 777-9 use more existing airport stands, but folded span alone does not guarantee compatibility. Stand length, pavement loading, taxiway clearance, tail height and passenger-bridge geometry still matter.

Which is Boeing's largest passenger aircraft?

The 747-8I is Boeing's heaviest passenger aircraft delivered to airlines, while the 777-9 takes the length and wingspan records.

Published planning layouts often quote approximately 410 passengers for the 747-8I and 426 for the 777-9. Those figures are not directly comparable: they use different seating-class assumptions, and an airline's galleys, premium cabins, crew-rest areas and seat spacing can change capacity dramatically.

This is why seat count is a poor stand-alone measure of size. A densely configured aircraft can seat more people without being longer, wider or heavier.

Which is Boeing's largest cargo aircraft?

The 747-8F is Boeing's largest conventional freighter by maximum take-off weight and structural payload, carrying up to roughly 137.7 tonnes of payload under the appropriate fuel and range conditions.

Its raised cockpit permits a hinged nose door, allowing long cargo to enter directly onto the main deck. Payload is not simply maximum take-off weight minus empty weight: fuel, reserves, route length, runway performance and structural limits all reduce what can actually be loaded.

Does the Boeing Dreamlifter count as the largest?

The Dreamlifter is Boeing's standout aircraft by cargo volume, but it is a specialised 747-400 conversion rather than a general-purpose production freighter.

Its enlarged upper fuselage provides about 1,840 cubic metres of cargo space for bulky, relatively low-density aircraft sections. It is also around 21.5 metres high. Despite that enormous body, its payload is about 113.4 tonnes, below the 747-8F's limit. The Dreamlifter therefore wins on volume, not payload or maximum weight.

Where do the 777-300ER and 787-10 fit?

The 777-300ER is the established long-body Boeing twinjet benchmark, while the 787-10 is the largest Dreamliner but remains smaller than the 747 and long-body 777 families.

The 787-10 is 5.6 metres shorter than the 777-300ER and nearly 12 metres narrower in wingspan than the extended 777-9. It prioritises twinjet efficiency and passenger capacity rather than being Boeing's absolute size leader. A closer comparison of all three Dreamliner sizes explains why the longest 787 is not automatically the best variant for every route.

What causes misleading Boeing size comparisons?

Most contradictory rankings come from mixing measurements or comparing incompatible configurations.

• Calling the longest aircraft the largest: length does not reveal weight, fuselage volume or payload.
• Using maximum seats: certification limits and dense layouts are different from typical airline seating.
• Confusing MTOW with payload: MTOW includes aircraft, fuel, passengers, baggage and cargo.
• Ignoring folded wingtips: the 777-9 has different ground and flight spans.
• Treating the Dreamlifter as an ordinary freighter: its swollen body was designed around oversized aircraft components, not general freight efficiency.

How does aircraft size show up in a flight simulator?

Large-aircraft dimensions are most apparent during taxi, stand selection and rotation rather than cruise.

The pilot must allow for the main landing gear cutting inside the cockpit's path during turns, limited wingtip clearance and the tailstrike risk associated with long fuselages. Add-ons do not always reproduce folding wingtips, steering geometry, weight limits or ground clearances accurately.

Within FSX, a flyable 747-8 representation can be compared with a 777-300ER simulator package. Their visual models convey the difference in cockpit height, fuselage length and four-engine versus twin-engine layout, but add-on payload-manager figures should not replace real aircraft specifications.