The six passengers traveling on a medical jet before it crashed in Northeast Philadelphia Friday night have been identified by the Mexico-based company that was operating the small plane.All those onboard the Learjet 55 aircraft,

Investigators have not been able to locate the aircraft's black box yet, which could provide clues into the cause of the crash.

At least seven people were killed and 19 were injured when an air ambulance crashed to the ground on a busy Philadelphia street, creating what witnesses described as a massive fireball and a chaotic s