A call came in reporting an aircraft crashed around 12:30 p.m. near Kirker Pass and Nortonville roads between the cities of Pittsburg and Clayton, said Fire Inspector Steve Aubert of the Contra Costa Fire Protection District. California Highway Patrol and regional park authorities responded to the scene alongside Contra Costa County sheriff’s deputies and firefighters. The aircraft was destroyed in the fire that followed the crash, said Ian Gregor, a Federal Aviation Administration spokesman.