Single-engine jets remain some of the most extreme aircraft a pilot can strap into, and several of the fastest are still ...

Even with all the money in the world, you might struggle to purchase jets capable of quickness above Mach 0.9. However, some were sold to civilians in the past.

A Cessna 172 can typically cruise at around 140 mph (225 kph). Most commercial airliners fly fast enough at altitude that speed is measured in how close the aircraft's speed is to the speed of sound.