As ridiculous as the above statement sounds, I actually have no difficulty believing the conversation probably did go something like that. These films are known for taking things over-the-top, making an effort to push the envelope at least a few times throughout each installment so it's likely some action sequences are of top priority. Wan is a filmmaker who prides himself on his instantaneous thought when it comes to building out sets and scenes on the spot and took the above demand as a “blank slate to go and design the craziest action sequence” he could dream up. What he came up with is “cars jumping out of the back of the plane, hitting the mountains of Azerbaijan, and then assaulting a military motorcade.” How's that for an answer?!
Wan also recently discussed some of the details on how he and his crew executed upon the incredibly high-octane parachuting cars sequence in a recent commentary with Yahoo! Movies. Check out the video below to watch the play by play of what the filmmaker calls one of the highlights of the film.
Also read: A round-trip flight just for the view