The long evolution of Aerion is about to enter a new phase, arguably its most significant to date. According to Co-chairman Brian Barents, the company is nearing final evaluation of two engines—which he did not identify—to power its AS2 supersonic business jet. Engine selection is likely this summer or fall, he says. The journey to that milepost has been challenging. The Aerion design traces back to years of work put into refining supersonic natural ...

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