Someone sent me this video last night and I'm not sure what to make of it. At first I just thought it was just a misidentified airplane, as you can hear the engine of a craft in the background. But the light configuration isn't one of any aircraft I know. There are no red or green navigational marker lights that any conventional aircraft would have (this includes helicopters).
Perhaps it's someone in an ultralight playing a prank (that would explain the engine noise). Or maybe it was some experimental government aircraft (though why in Rancho Cucamonga?) doing a test flight at night. All I know is there are some strange things in the skies of California.