Boeing just launched a new $400 million 777X private airliner, and it's a flying mansion that can go halfway around the world

The BBJ 777X is based on the new Boeing 777X airliner.

Like the commercial airliner on which it is based, the BBJ 777X will be available in both 777-8 and the larger 777-9 variants.

The BBJ 777-8 has a range of 13,400 miles while the larger BBJ 777-9 can go up 12,700 miles. That's several thousand miles further than the airliner versions of the planes can fly.

In fact, the BBJ 777X is the longest range private jet ever made. That means flights from Sydney to London or Seattle to Dubai are possible.

Power comes from GE's massive GE9X engine that returns 5% lower fuel consumption than rival powerplants while producing 29% lower emissions.

The 777X boasts a 236-foot wingspan along with a cabin that's 7.9 feet tall and nearly 20-feet wide.

The 777-9 is 33 feet longer than the 777-8 and as a result, has more room. The 777-8 boasts 3,256 square feet of interior space while the 777-9 has 3,689 square feet. That's about as much interior space as a large suburban home. A very luxurious suburban home.

Boeing all showed off interior concepts for the 777X from three different firms. The first is from Jet Aviation which opens with a stylish entrance way.

To the right of the entrance way is a massive lounge which...

... Boarders a stylish dining room and...

... Bar.

At the back of the interior is a large master suite complete with a master bath and closet.

Next up is the interior concept by Unique Aircraft Design. Here's the entrance way.

To the right of the entrance way is an open lounge.

Further towards the back of the plane is the dining room. Aft of the dining room is a compartment of first and business class seats.

To the immediate left of the entrance way is the office.

Further towards towards the front of the plane is the master bedroom and...

.... Master bathroom.

Finally, there is the design from Greenpoint Technologies. Here's the entryway.

To the right and left of the entrance are lounge areas.

Within each lounge, the space is divided using various furnishings.

Aft of the main lounge is a guest bedroom complete with...

... A sitting area.

The Greenpoint design's highlight is the master suite at the back of the plane.

First up is the large, plush bed.

Aft of the bed is a full walk-in closet.

Here's a another look at that amazing closet.

Aft of the closet is the master bath.

It features a standalone shower and stone floors.

There is also a his-and-hers vanity.

BBJ did not say how much the custom interiors would cost, but it's safe to say it's in the hundreds of millions of dollars.

The Boeing 777-8 has a list price of $394.9 million. The larger 777-9 costs $425.8 million.

The Boeing 777-9 is expected to enter service in 2020 and the 777-8 is expected to follow soon after.