Aircraft part exchange

[Tesla]

Oh, I see. I suppose it would be possible. Not sure if it would be utilized much however. People selling usually want cash, not part cash and another aircraft they may or may not have a use for.

Hence why the PX offer has to be accepted by the seller. 

Also, auction of aircraft in the used market? Rather than a fixed price, users bid over a time period. Choice of the seller whether to sell direct or by auction, and if by auction they decide whether the plane leaves for the closing price or decline it