The C-5 Galaxy, by Lockheed Martin, is one of the largest aircraft in the world and the largest airlifter in the Air Force inventory.
This model was created for RealFlight by Doug Kaye (DHK79), as a special request from pantherflyr. The model includes Slats, Fowler Flaps, and some very unique heavy duty landing gear.
EDIT 8/6/2010: After being up on the swaps for over 2 1/2 years and being downloaded some 9042 times, someone finally noticed that I had made an error in the elevator (i.e. this plane doesn't have one). I have corrected the discrepancy and re-posted the model. Thanks to all of you who were kind enough to also pull down your AVs so that I could make the update.
CAUTION: As you can see from the size of the download (over twice the size of most) this is a very complex model. It has a lot of moving parts and extra aerodynamically active wing surfaces, it may not perform well on less than optimal systems.