Hypersonix is an Australian startup looking to change aviation as we know it.

North American Aviation’s X-15 rocket plane reached 4,520 mph and climbed to 354,200 feet during a program that ran from 1959 to 1968, producing flight data NASA credits as foundational to later U.S.

Liftoff of the "That's Not a Knife" suborbital mission occurred at 7 p.m. ET on Friday (Feb. 27). When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.