See the luxe cabin designed for Boeing's more than $400 million BBJ 777X private jet targeting the world's wealthiest

Other versions in development are the 777-8 and the 777-9 passenger variants, and the 777-8F freighter.

The BBJ version was unveiled in 2018.

Boeing has faced myriad challenges during the development of its 777X.

These include the pandemic, supply chain problems, and the 737 MAX crashes, with Boeing estimating in July that the program had at least $1 billion in "abnormal costs."

Airlines including Qatar Airways, Lufthansa, Etihad Airways, Singapore Airlines, and Cathay Pacific Airways make up the more than 360 orders for the 777X.

Emirates added another 90 777X planes to its order book during the Dubai Airshow, bringing its total backlog to 205 of the twin-engine jetliners, Investors Business Daily reported.

For the first BBJ 777-9 order, the company did not disclose the buyer but said governments typically purchase large business planes like this, FlightGlobal reported.

"The BBJ 777-9 is the largest aircraft type newly available on the market and thus simply predestined for its role as successor to the BBJ 747 as the most popular aircraft for heads of state, many of which are among our loyal customers for decades," Lufthansa Technik's sales director Middle East VIP & special aircraft services, Hassan Gasim, said.

The giant space includes a private bedroom, bathroom, and "Work&Balance" area.

Lufthansa Technik notes the jet's specially designed windows make guests feel like they're at home and not at 30,000 feet.

According to Lufthansa Technik, the rain and massage shower is the largest ever designed for a business jet.

Special technology can create an "almost immersive wellness and entertainment world."

Movie screens, 180-degree images of the next travel destination, and digital art can all be installed inside the cocoon, according to Lufthansa Technik.

The Boeing 777X will have one of the widest cabins of any twinjet airliner, giving designers much space to work with.

The room also features two swivel chairs, two divans, and a headdesk.

According to Lufthansa Technik, this room creates a "perfect first impression" and is intended to be a warm welcome to VIP guests.

"Intermediate doors shield guests aesthetically and acoustically from the outer functional doors of the aircraft cabin, creating an all-around pleasant feeling of space in abundance," the company explained.

Lufthansa Technik took inspiration for the 777X from the Middle East, and this specific room meets the requirements of a "majlis," or a "traditional Middle Eastern gathering and meeting room," according to the company.

The conference layout has monitors that can be lowered into the table to create a dining setting, according to Lufthansa Technik.

The first half of the aircraft is mostly living and meeting space, while the second half is passenger seating for people like "advisory staff or other personnel."

Designed for "high-ranking ministers or state guests," Lufthansa Technik's "Deluxe Suites" at the front of the cabin are first-class-like compartments.

"The CelestialSTAR cabin design is the first of its kind to be derived directly from the BBJ 777-9 design data provided by Boeing Business Jets," the company said. "This ensures the technical feasibility of the design from the outset because only 100% correct dimensions were used as a basis."

Three design firms, Greenpoint Technologies, Jet Aviation, and Unique Aircraft Design, released cabin designs for the 777X back in 2018, which include similarly luxurious bedrooms, lounges, and bathrooms.