Large Supersonic Aircraft is Not a New Technology.
Predecessors
The large supersonic aircraft have been flying for over forty-five years and the Zephyr builds on their successes and experience utilizing proven but commercially unused technologies. The XB-70 first flew at speeds in excess of Mach 3 in 1964 and weighed almost 535,000 pounds. The Concorde started its illustrious career over forty years ago without the advantage of the advanced engine designs available today. The B1A was the first large aircraft to utilize swing-wings in 1974 to obtain speeds similar to the Zephyr. These aircraft have flown throughout their lifetimes without any accidents attributed to their unique technologies.