An L-39 Albatros from the Heavy Metal Jet Demonstration Team performs during the 2011 Dakota Thunder airshow at Ellsworth Air Force Base, S.D., June 4, 2011. Nearly 40,000 people of all ages and walks of life converged here to watch the vast array of aerial demonstrations and view numerous static aircraft. (U.S. Air Force photo/Tech. Sgt. Nathan Gallahan)