25. Bell X-1 670mph
Photo: wiki
The Bell X-1 was a very important aircraft in the sense that it laid the foundation for supersonic travel in the future. Its first flight was held in January of 1946. Famous test pilot Chuck Yeager was the one who first piloted the X-1 up to the speed of sound, and unofficially up around the 1,000mph mark. It also could fly at altitudes up over 70,000 feet which must’ve been quite scary at the time considering it wasn’t a common thing in any way.