I made a helicopter out of fondant/gumpaste and attached everything using spaghetti noodles. I premade holes in the structures and allowed them to dry then put the side with the spaghetti still attached into the main part. I would think you could do an airplane in a similar fashion. I hope that this makes sense!
You could cut the wings out of cardboard & it would be a lot lighter & you wouldn't have to worry abou the wings being stiff enough to not bend. Just lightly mist the cardboard & cover w/ fondant
thank you both for your great ideas.
Its is not due for several weeks but i think i am going to work on it now. See how to work out the kinks if anything happens.