A single-engine Cessna 170 and an experimental aircraft crashed in midair over the Nevada desert Sunday and both pilots were killed in the crash, authorities said. The incident occurred near a dry bed in northern Nevada’s Lyon County. Each pilot was flying alone and no injuries were reported to anyone on the ground. The names of the pilots, who were pronounced dead at the scene, were not immediately available. The collision occurred during an informal weekend fly-in at the dry lake bed, the Lyon County Sheriff’s Office said. The wreckage of the planes was entangled on the ground. Witnesses told authoritis they heard a loud “pop” then saw debris falling.