Another vintage military plane has crashed at a United States air show, a day after a horrific plane crash at a Nevada air show on Friday killed nine people and injured dozens more. In the latest crash, a military trainer aircraft went down in a fireball at an air show at Martinsburg, West Virginia yesterday. The pilot was killed, but there were no other casualties. Meanwhile, Nevada police have raised the death toll from three to nine people after a P-51 Mustang crashed at the National Championship Air Races when its elderly pilot apparently lost control of the WWII aircraft and plunged into spectators at full speed. National Transportation Safety Board investigators are probing the accident. The plane narrowly missed a grandstand packed with people. More than 50 people were injured in the Nevada accident, eight of them remain in a critical condition. The city's deputy police chief, Dave Evans, said the remains of seven victims, including the pilot, have been recovered from the tarmac.