Preflight Checks Airmen conduct preflight checks in the cockpit of an aircraft at the Royal Air Force station near Mildenhall, England, during Exercise Astral Knight, June 3, 2019. More than 900 U.S. airmen are participating in Astral Knight to support the collective defense and security of NATO allies and U.S. forces in Europe. SHARE: Download: Full Size (0.7 MB) Tags: Air Force Credit: Air Force Airman 1st Class Brandon Esau VIRIN: 190603-F-QO224-1012C.JPG Photo Gallery