Hello and thanks, Gus!
I will answer your question with a question, "How do you think I made the little bi-plane fly?" ... 
I can tell you this, Gus ... "Indianna's suspicions (although petty good) are incorrect. I did not use PhotoShop or any other layering program to make the bi-plane fly."
All the best,
Richard
Well ... My first choice would show threads ...
Maybe you used a big piece of glass, with the plane on it, and shot a pic ... Even so, if done by me, It'd probably give odd reflexes ... Or not, I'd have to (and might, possibly, in the future (...)) try.
Was a piece of glass, then, or something else? These are the only two ways I can imagine.
Gus
Ps. However, I don't think you used a big glass method with the first shots, showing the plane taking off of you pool 
... So, it's still a mystery. / G.[
Ps. # 2 ; And, once the plane isn't damaged (not to mention that it's pretty a rare piece of playmovehicle ...), I believe you don't actually throw it off, and take the pics ... 
That would be shocking!]
[
Ps. # 3 ; I disbelieve any non-physical levitation method, and I can't see any device installed under the plane to make it float ... 
/ So, I guess I simply have no idea 
]
