Virgin Galactic flights from London to New York in less than four hours could be offered as soon as 2023. CEO Sir Richard Branson announced his company is working with Denver-based U.S. aircraft developer Boom to create the prototype.

It’s estimated that the initial intercontinental supersonic flights will be expensive, probably as high as $5,000. However, as competition grows and many airlines develop advanced aircraft, costs are expected to drop to current ticket prices. www.theguardian.com/business/2016/nov/15/richard-branson-supersonic-flight-virgin-boom