Base spokeswoman Connie Hempel said Friday that the jets, an F-35C and an F/A-18, were in the air from about 9:20 a.m. to 12:20 p.m. along a strip of airspace that runs along the Delmarva, up to 12 miles off the coast and 3 miles away at its closest. Weather officials at the base said the sonic booms the aircraft created could have likely traveled further than normal because a temperature inversion was in place, when there is warm air aloft holding colder air in place below, with calm winds and recent passage of a cold front, Hempel said.