I got stuck in a wiki loop hunting down Turbofan and Turbojets and I found this.  The AM-62 snark.  The same Turbojet in the DC-8, 727, 707 and B52 (among others) propelled this celestially guided rocket assisted 3.8 megaton nuclear cruise missle 5500 nautical miles at 55,000 feet.  This sucker was 62 feet long with a 42 foot wingspan!  To give a sense of scale...this is about as long with about the same wingspan

I didn't work very well or make much sense after ICBM's but still.  Dayum!