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The aircraft, which had two people on board, was en route to Springfield-Branson National Airport in Missouri, the FAA said. Radio audio from air traffic control describes the downed Learjet in Philadelphia as a “medevac” flight.

The plane reached 1,650 feet shortly after takeoff before plunging, according to data from ADS-B Exchange. The data shows the final speed of descent was 11,000 feet per minute.

As the controller tries to contact the plane, there’s a callout, heard on LiveATC.net, “Medevac med service, northeast tower. Medevac med service, northeast tower. Are you on frequency?”