(Reuters) - Supersonic passenger travel, which died out with the Concorde's demise in 2003, will make a comeback by the mid-2020s if three entrepreneurial U.S.-based companies can make jets quiet and efficient enough to win over buyers and fliers.
Fifteen years ago, Boeing Co
Now Japan Airlines Co Ltd <9201.T> and Virgin Group are backing one of the three U.S. supersonic projects, Denver-based Boom Technology Inc, which plans a 55-seat all business class jet.
Lockheed Martin Corp
Concorde was developed in the 1960s, meaning this is hardly a new technology. But the program was government-backed, with only 14 jets ever delivered to then-government owned British Airways
New players are relying on venture capital funding models.
"This is more about engines and economics than it is about airframes," Richard Aboulafia, the vice president of analysis at aerospace research firm Teal Group, said of the challenges of a supersonic revival.
To make the project economics stack up the engines need to be far more fuel efficient and less noisy than those used by Concorde or fighter jets.
That has proven tough to engineer, especially at higher speeds like the Concorde's Mach 2, which halved the travel time from London to New York to 3.5 hours.
Engine manufacturers and jet makers have spent decades improving fuel efficiency, expanding range and reducing noise.
But to get up to mach speed, a supersonic jet requires an engine core more like those on the commercial jets of the 1970s and 1980s which noisily gobble more air and fuel.