PHILADELPHIA (AP) — The families of two of the eight people killed earlier this year when an air ambulance crashed in Philadelphia filed a lawsuit on Monday, claiming the medical air transport company and others negligently caused their deaths. The wrongful death case was filed by the estates of Dr. Raul Meza Arredondo, a pediatrician, and Lizeth Murillo Osuna, the mother of a girl who was flying home to Mexico after being treated at a Philadelphia hospital. All six people on board the Learjet