Supersonic jets actually break the sound barrier when taking off, which was deemed too disturbing for people on the ground. But now, Lockheed Martin hopes to build a quieter version of the ultra-fast jet.

The company recently released plans for a Quiet Supersonic Technology Airliner, a twin engine plane that would transport 40 people at speeds of Mach 1.8, or roughly 1,380 mph. That means a flight from London to Tokyo would take just more than 7 hours instead of the usual 12.

“Right now, we’ve only done early conceptual design studies to establish that the design is feasible, do sizing for the concept, how big it should be, how much it should weigh…Those early sensitivity studies to make sure it all makes sense,” Mike Buonanno, aerospace engineer, Lockheed Martin, told CNN Travel.

The plane would have an extended super-sharp nose that would sculpt sonic shockwaves and avoid creating a sonic boom. Rather than a disturbingly loud sound, people on the ground would only hear a sound equivalent to the slamming of a car door.

“Ultimately airlines determine how they arrange their seats, but we’ve nominally configured the airplane for 40 passengers,” added Buonanno. “We did considerable market research and found that this was the sweet spot for the size of this type of airplane, basically maximizing the number of markets that can be addressed by the airplane.”

“Right now the primary focus is to get that data to solve the regulatory challenge,” Buonanno said. “The goal is to get that data by 2023, there’s a rule-making cycle that goes on and we’re working towards that goal for supporting that mission.”