# Boeing's 777X cabin, seven years late

> Inside the mock-up of Boeing's biggest twinjet: wider seats, an arched business class, and windows that fix a decades-old mistake.
- Title: Boeing's 777X cabin, seven years late · Business Insider
- Summary: Inside the mock-up of Boeing's biggest twinjet: wider seats, an arched business class, and windows that fix a decades-old mistake. The 777X sells itself on…
- Keywords: boeing, aviation, 777x, air travel, airline cabins, business, technology, Boeing's, cabin, seven, years, late
- Source: Business Insider — https://businessinsider.com/boeing-777x-jet-cabin-what-passengers-can-expect-2026-9
- Author: Taylor Rains
- Published: 2026-09-15T19:12:28.14+00:00
- Read time: 2 min
- Topics: boeing, aviation, 777x, air travel, airline cabins, business, technology
## Seven years late
Boeing planned to deliver the 777X in 2020. It has since absorbed more than $15 billion in charges and still is not certified, with passenger flights now expected in 2027.
## The biggest twinjet flying
The 777X is the largest twin-engine widebody in production: over 400 seats, folding wingtips, giant GE engines, and range up to 9,000 miles nonstop.
## Why airlines need it
Over a dozen carriers are waiting, with more than 560 orders placed. Lufthansa launches it, and airlines have built it into plans to chase premium demand and retire thirsty old widebodies.
## Emirates is annoyed
Quality-control and safety problems slowed certification, and some buyers are paying to keep aging jets flying. Emirates has refused delivery of some of the earliest-built 777Xs.
## A foot wider than Airbus
Engineers thinned the sidewalls and insulation to add a foot of cabin width over the A350. Economy stays 10-abreast, but seats reach 18 inches wide.

> It's the only airplane in the market today that can seat 10-abreast comfortably in economy
## Moving the exit door
On the shorter 777-8, Boeing shifted an exit door aft so its required aisle no longer splits business class. The door now marks where the premium cabin ends.
## Seats are the bottleneck
Fancier premium seats take longer to certify. Lufthansa has flown 787s with empty business seats waiting on approval, so Boeing offers pre-certified catalog options airlines often reject.
## An arch up front
Boeing stripped the center overhead bins from the premium cabin, since it needs less storage. The result is an arch that makes the front of the plane feel taller.
## An upside-down V in coach
Economy keeps its center bins, flipping the arch into a V. Boeing says that tricks the eye into reading more horizontal width, which is what coach flyers actually notice.
## Windows that sit higher
The second-largest windows in the industry, mounted higher on the sidewall because older jets wrongly assumed people wanted to look down. Dimmable glass keeps a horizon for middle seats.

> The dimmable windows are a way to cut the light without taking away that horizon.
## Key takeaway

The 777X sells itself on cabin feel, not raw size: an extra foot of width, tricked-out lighting, and premium space airlines can carve up however they want.