I took a tour of the Boeing Factory (it's the building to the left, largest enclosed space in the world. I got to see 747's, 777's, and 787's being built. Sadly, cameras were not allowed. When we came back, this Antonov 124 was taking off (extremely impressive thing to see). The tour guy said that this plane is brought in when a supplier misses a deadline and is a little late on sending things through the normal means (train, truck). Behind, you can see some of the dozens of aircraft of all different types getting outfitted and tested before delivery. I love airplanes and this place was heaven!