Superman-16
From superman.nu: Supermanica
Superman-16 aka S-16
The name of the experimental rocket plane created by the US Air Force and named after Superman. The S-16 however doesn't work properly during a test run when the pilot loses control just as he turns its rocket engine on and the plane is sent crashing toward Earth. Thankfully the pilot safely ejected and Superman then manages to grab the S-16 before it crashes and take it "...to its highest range, 100 miles above Earth!" and Superman thinks to himself "Now it can blow up safely!" which it does.
This sequence took place during Superman's feverish dream on Htrae and it is not known if this rocket plane was actually developed in reality by the USAF (Act No. 264, May 1960: "The Superman Bizarro!").
