as you can come up with. we get in a plane and we see those big engines out the window. how does this technology differ from what we're used to in the, i mean all of us don't have that great of an understanding about how planes work. but we see engines and wings and we go up. how is this technology, frankly different with the supersonic technology? how are the engines different? how are they placed differently? how is the whole thing a little different than what we're used to? >> you're actually got a pretty close. it's all in the integration, you still have a fuselage, but it's thinner and longer. the wings have higher sweep. the engines don't have the big, large, large-diameter fans you see on a typical subsonic airplane. they tend to be a little smaller and they have something up front that helps compress the air and slow it down for supersonic speeds. so the technology bits that go into all of those things. but really the important thing about it is developing the design knowledge and the design