From The Internet Movie Plane Database
Sylvester Stallone (Lt. Marion Cobretti)
Brigitte Nielsen (Ingrid Knudson)
Reni Santoni (Sgt. Tony Gonzales)
Andrew Robinson (Det. Monte)
Brian Thompson (The Night Slasher)
John Herzfeld (Cho)
Los Angeles police lieutenant Marion Cobretti, alias "The Cobra," is the cop who does the dangerous jobs other cops can't handle. When model Ingrid Knudson witnesses a murder by the notorious serial killer nicknamed the Night Slasher, Cobretti has to protect her from the Night Slasher and his gang of murderers.
Police helicopter. Registration N250CA, also seen in other movies at IMPDb: Frequently Seen Aircraft.