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Normal aging is blamed for yesterday's F-18 crash, which killed at least three people; should these planes still be flying? An explosion shook the San Diego neighborhood of University City yesterday afternoon when a U.S. Navy fighter jet crashed into a house . The pilot of the plane safely ejected, but a mother, child, and grandmother died when the plane hit their home, and another child is still missing . The crash occurred near Camp Kearny in Miramar, CA, home to the Navy's Top Gun fighter pilot school. With smoldering wreckage still being collected from the crash site, the Navy said it is too early to determine the cause of the crash. According to Marine Corps spokesperson Corporal Francis Goch, the plane, an F/A-18D Hornet, was returning from training when the pilot radioed air traffic control about a problem, ejecting shortly thereafter . " He radioed into air traffic control, he said he didn't know what the problem was ," said Goch. " Right now the...