What it’s like inside Boeing’s new 777X

(CNN) — Described as “the world’s largest and most efficient twin-engine jet,” the Boeing 777X was originally scheduled to enter into service in 2020, but the launch of the jetliner has been beset by delays.

Now expected to debut in 2025, the airplane’s most striking exterior feature is undoubtedly its folding wingtips — a first for commercial aviation.

But what will it look like from the inside? This month, Boeing proudly showcased a test-version of the 777-9X, one of two 777X variants, at the Farnborough Airshow, a UK-based aviation trade event, providing a hint of what passengers can expect.

The 777 has been a big success for Boeing since it began service in 1995, and remains the best selling wide-body aircraft. The 777X follows on from the popular but aging 777-300ER, and looks set to become one of the aircraft manufacturer’s key airliners.

One of the most noticeable things about the experimental plane, aside from the fact that it’s filled with monitoring equipment, is just how huge it is.

Enormous aircraft

Measuring 251 feet, the aircraft can seat 426 passengers in a standard two-class configuration, and is longer than both its predecessor the 777-300ER (242 feet 4 inches) and the Airbus A350-1000, which has a length of just over 242 feet.

In the demonstrator plane, much of the space inside the cabin is currently taken up by testing stations, along with huge water tanks used to balance the aircraft during test conditions.

Although the aircraft has the same external width as the 777, its side walls are thinner, so there’s enough room for 10 18-inch wide seats in economy.

Then there’s the windows. Not only are they about 16% larger than those on the 777, they’ve also been installed higher on the fuselage to provide passengers with more natural light and a better view.

There were no overhead bins on show inside the demonstrator 777-9X, but Boeing has stated that those fitted on board will be able to hold twice as much as normal bins and require 40% less force to close.

According to Boeing, the best features of the 777 and 787 Dreamliner families have been brought together for the 777X, with added advancements, and the similarities are obvious.

Bigger windows

The windows on the 777X will be around 16% larger than those on the 777.

Justin Tallis/AFP/Getty Images

“It has the same passenger features as the Dreamliner,” explains…