The Falcon 7x has one of the largest cabins in the Heavy Jet category.
https://centraljetcharter.com/falcon-7x.html FALCON 7X Information There is no better example than the Dassault "Falcon 7X;" it flies higher, farther and faster than any of its predecessors, the FALCON 7X. When it comes to the business jet mission a smooth and stable flight with the precision to make a safe and predictable touchdown in the worst weather is what everybody wants -- particularly the passengers. The computers automatically correct for any gusts or turbulence that displace the 7X from its present flight path. This keeps the airplane traveling to where you want it to go, but also has the unintended effect of smoothing the ride. Because the DFCS system instantly makes very small control movements when the 7X hits turbulence, the bumps, wallows and rolls that other airplanes experience are minimized. That long and very flexible wing also helps damp out the jolts of turbulence that are transmitted to the cabin. The fly-by-wire control technology, adapted from Dassau