Douglas X-3 Stiletto
This early X plane flew from 1953 – 1956 and tested all sorts of technologies and techniques necessary for safe and sustain supersonic travel. The X-3’s unique frame started with an ultra slender, streamlined “needle nose” design and small trapezoidal wings. The hope was to craft the thinnest shape possible and cut down on drag when breaking the sound barrier, but that was just the most striking feature.