At my friend house the three of us in the back yard just talking. I'm looking west toward Santa Monica Beach. This small triangle flying about 4000ft moving very fast dim light on corner of the wing. Hey look that same triangle i seen before we all look at, It his mom said,its a bird, no its not a bird. My friend said It have tan bottom Made a right turn before Santa Monica Airport going toward Culver City, Ca, and no sound just fade away.