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.

The Learjet, carrying a pediatric patient and five others, crashed on Friday, killing all on board. On the ground, one person was killed and at least 19 others were injured, officials said.