Dave Folio, a spokesperson with the Scottsdale Fire Department, said at a press conference that at least four other people were injured in the crash.
One person remains trapped inside one of the planes and first responders were working to free them, he said, while three other people were taken to area hospitals.
Folio provided no other details and it was not immediately clear what caused the jet to skid off the runway.
The Federal Aviation Administration said in a statement that it was investigating the crash, which it said involved a Learjet 35A that skidded off the runway, which then collided with a Gulfstream 200 jet.
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