Boeing's Icon-II

Another design for supersonic flight over land is the Icon-II, from Boeing. It would also achieve NASA's fuel burn reduction and airport noise goals, Boeing says.

NASA says that phase two of its trek toward the aircraft of 2030 began in late April when the four teams submitted additional proposals related to improving the air transportation system (better energy efficiency, lower environmental impact). The aerospace agency plans to award one or two research contracts for work starting next year.