The Civil Air Patrol continues to assist the Sierra County Sheriff’s Office, and the California Highway Patrol in the search for a missing plane with two people on board. The Socata TB-20 Trinidad left the Truckee-Tahoe Airport in Truckee just before 4PM Monday . Family members reported the plane it overdue Monday night when it failed to arrive at Petaluma Municipal Airport. The Sierra County Sheriff’s Office says the passengers of the plane are reported to be pilot Brenda Richard and her husband Mark Richard.