Virgin Galactic is planning a test campaign for its LauncherOne small satellite launch vehicle next year consisting of multiple trial-launches to pave the way for commercial missions.The air-launched vehicle, first announced in 2012, has undergone some significant evolutions since inception, including a doubling of its payload performance, improved engines and switching carrier aircraft from WhiteKnightTwo to a Boeing [BA] 747-400 nicknamed Cosmic Girl. Since then, Virgin Galactic has also built and furnished a LauncherOne manufacturing plant in Long Beach, Calif.,…