The infamous U-2 Spy Plane, built by Lockheed Martin and the United States Airforce, was flown by the CIA and was relatively unknown until one Captain Garry Powers got shot down by Soviet missiles. This model is a replica of the variant used by NASA in the early 1960's and 1970's to collect data from satellites orbiting the Earth and is on display at the National Air Force Museum in Dayton, Ohio. While it performed with unmatched efficiency and power at the time, the U-2 was (and.....still is) notoriously difficult to fly. Early variants of it had to have detachable wing gears attached to downward-facing winglets to get it off the ground. Landing was a more treacherous in earlier models because you had to land precisely dead center of mass. Its engine performance, however, is quite efficient. The only time you need 100% throttle flying these is when you are taking off, or flying at extreme altitudes (above 70,000ft). It is still in use today by NASA, the United States Air Force, and NOAA to upgrade firmware in low-orbit weather and GPS satellites.