A plane that crashed in Philadelphia this week was transporting a Mexican child and her mother back to their home country following months of “life-saving treatment” in the U.S., according to reports. All six crew members and passengers onboard the doomed Learjet 55 have been identified as Mexican nationals. On Friday, a Mexico-based Jet Rescue Air Ambulance bound for Tijuana slammed into a neighborhood in Northeast Philadelphia moments after takeoff, igniting fires that scorched residences and incinerated multiple vehicles. All aboard the air transport were killed, along with a victim on the ground, and at least 19 more were injured....