Thunderbirds Demo The Thunderbirds, the Air Force's flight demonstration team, perform during the Sioux Falls Air Show in Sioux Falls, S.D., Aug. 18, 2019. SHARE IMAGE: Download Image: Full Size (0.33 MB) Tags: Air Force Photo By: Air Force Tech. Sgt. Duane Duimstra VIRIN: 190818-Z-SJ722-1064C.JPG Photo Gallery