HyperMach Aerospace, a U.K. company with ambitious plans to develop a $180 million supersonic business jet, released revised performance figures at this week's Dubai Airshow, announcing that the SSBJ will be capable of flying at Mach 4.0. That's a marked increase from the Mach 3.6 top speed provided when the company launched the project over the summer. At the new top speed, HyperMach's SonicStar would be capable of traveling from New York to Dubai in 2 hours 20 minutes. And, with a range of 6,000 nautical miles, it could easily make the trip nonstop. What's more, the speedy airplane would have space inside to accommodate 20 passengers.