Unfortunately, large aircraft tend to be hard to set on shelves, to display on walls, unless they are very short wingspan planes. Ships and cars, however, are narrower than aircraft, so work better on shelves. The only real way I know of for large aircraft is hanging it from ceiling. I had the Lindberg Graf Zeppelin hanging from ceiling till one of the support threads gave way. :-(
The display problem with large scale aircraft has caused me to stop building them. In fact, I am doing more 1:144 and 1:72 aircraft lately. Also, I don't have room for any more shelves, so I am looking for ways to get rid of some of my ship models, so I can re-use some of the shelves they are on. Worst display problem was a ship, le Real, a French galley. Didn't realize, when I started building it, that it was 16 inches wide when finished! Too large for wall shelf. It is sitting in a big box in basement. Trying to find a new home for it!