The article lists several candidates from the movie. I've bolded the likely possibilities:
Douglas DC-3-G102A
Canadair Challenger 604
SIAI-Marchetti SF.260TP
Bell 205
Gulfstream V
Piper PA-28
British Aerospace BAE 125 Series 800A
Those are corporate jets. Aside from the DC-3, the others are single-engine planes or a helicopter.
I am not even sure the book says what the plane is. In the back of my mind it seems it was a DC-3 but I don’t know that for sure.