I always thought wooden aircraft might also meet with, erm, “biological” attack in the jungle…
Oh, and Crab and PzKpfw VI Tiger, on the subject of flammability… We all know wood burns great, but it’s worth bearing in mind that Aluminium burns very well. In fact, I do remember seeing on a wooden crate for an aluminium aircraft part something along the lines of “WARNING! FIRE HAZARD - ALUMINIUM DUST!” :S