It appears as though simply owning not one but two professional sports teams, and one of the world’s largest yachts was simply not enough to quench the thirst of Microsoft co-founder Paul Allen. The billionaire entrepreneur first announced plans for the largest aircraft on earth — the Stratolaunch — in 2011, and after a few minor delays, Stratolaunch Systems has finally revealed the beastly bird. The company has some rather lofty ambitions for the project down the road. Eventually, Allen and company want the Stratolaunch to soar to low Earth orbit where it can launch a Orbital ATK’s Pegasus XL rocket into space. The rocket itself will be capable of carrying smaller satellites into orbit. As the system advances, Stratolaunch Systems hopes to one day send manned missions to orbit.

The Stratolaunch didn’t take flight at the unveiling, but the airplane certainly has some fairly impressive design specifications. The craft touts a sprawling 385 foot wingspan and uses six 747 jet engines for thrust. Fully fueled, the Stratolaunch tips the scales at 750,000 pounds and requires nearly 12,000 feet of runway for takeoff. But how does the aircraft size up to some of the largest aircraft in aviation history?