MODERN MARVELS: Extreme Aircraft

Modern Marvels looks at some of the most cutting-edge aircraft ever developed, from the X-1 that first broke the sound barrier to the X-43 Scramjet that recently flew at Mach 7.

These extreme aircraft have made their mark on aeronautical history, and sometimes on political history as well.

The U-2 and SR-71 spy planes played a crucial role in the Cold War, and now Lockheed Martin's top-secret "Skunkworks" division is touting the new "air dominance" fighter plane, the F/A-22 Raptor.