Again, Grumman engineers and visionaries didn't need a revolution in engines, aerodynamics or materials. They were all at hand. The revolution was the idea -- and risk -- that companies would pay what it really costs to fly their people in an airplane that had a cabin with standup headroom, the structure and system reliability of a true transport airplane, reasonable cruise speed, and enough range to cross the country, at least when flying downwind. The cost was frightful and most in the industry, and no doubt many within Grumman, doubted companies would buy the Gulfstream. But the G-I created the large cabin long-range business airplane category that Gulfstream still leads today.