Authorities say a passenger on a Delta Air Lines flight out of Los Angeles International Airport was detained for triggering the plane’s emergency slide prior to takeoff. LA airport police say the passenger opened an emergency exit door around 10 a.m. Saturday, causing the emergency slide to deploy as the plane was pushing away from the gate. A police official says the aircraft returned to a gate and passengers were put on another plane. The official says the person was not arrested, but transported to a hospital for mental evaluation. Delta didn’t immediately respond to a request for more information. The flight was heading to Seattle.