The Air Force is set for another large-scale exercise in the massive Powder River Training Complex in the Northern Plains.  The training area covers nearly 35,000 square miles of airspace in the Dakotas, Montana and Wyoming — the largest over the continental U.S.
Officials at Ellsworth Air Force Base in South Dakota say multiple types of aircraft will take to the skies Tuesday through Thursday, and cautioned that could cause loud noises, including sonic booms.  The Air Force cautions non-military aircraft to review the FAA notice of the exercise and avoid areas and altitudes where military planes will be practicing.