The pilot of a missing aircraft is feared dead after searchers discovered wreckage in the Pine Nut Mountains on Thursday afternoon.The red and white Cessna 172 piloted by Minden resident Keith Jorgenson, 46, took off from Minden-Tahoe Airport for a local flight 5 p.m. Wednesday. No flight plan was filed.“They found the wreckage and they don't think it's a survivable crash,” Airport Manager Bobbi Thompson said ThursdayWashoe County's Raven Helicopter spotted the wreckage in the Pine Nuts southwest of Mount Como.Members of Douglas County Sheriff's Search & Rescue spent Thursday calling surrounding airports and checking for emergency locator transmitter signals …