The Biggest twin-jet Airliner, B777-9X take-off from ground in Everett Field.
No doubtfully, most interesting feature is its fold-able wing-tip; it increases fuel efficiency within certain limit of its size. Larger engine, body and wing-span with lighter structure of composite made this aircraft as ~400 passenger class airliner.
Because of extinction of A380 and B747-8i, it would be the world's biggest airliner in 2020's. Still, Airbus has no competitor for its class; A350-1000 is similar to B777-300ER.
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