PHILADELPHIA — A key piece of hardware that aviation experts and pilots said could solve the mystery in the fatal crash of the medical transport Learjet on Jan. 31 turned out to be useless.

The Learjet 35A model received certain attention-grabbing honors like being selected to use as a military jet. Taking on the same role, it now operates with the name of C-21. The celebrity ...

Jet Rescue Air Ambulance, a company based in Mexico, operated the Learjet 55, a medical jet that crashed in Northeast Philadelphia on January 31 at 6:30 pm local time. The plane which was on its ...

Credit: NTSB The cockpit voice recorder did not record the moments before a Learjet 55 medical jet crashed earlier this year in a Philadelphia neighborhood, killing six people on the aircraft and ...