They do?! Just out of curiosity, would it screw with things if I buckle the seatbelt on a backpack? I enjoy doing that in our family's current SUV because I don't want my camera bag to fly forward in case of a sudden stop. Would that get affected making the system think there is a passenger in the seat? We're picking up our new Expedition sometime in April.
Certain trims do - Platinum for sure.
Depends on how the logic has been programmed for these airbag seatbelts. None of us can test this non-destructively. Only the Ford engineers know for sure.
If I had to hazard a guess, the risk of not firing the airbag for a belt that is buckled, is greater than the risk of not firing the airbag. If the belt is buckled you have to assume worst case, and that a passenger is seated there. And so airbag would win. Now, do those captain chairs have weight sensors in them like the front seats - not sure. And even if they did, the risk is too great to not fire the airbag.
Put your bag in the footwell or trunk like everyone else?