Bad Piggies Flight in the Night Bonus Level 4-VIII (4-8) can be 3-starred with a single contraption. Use a basic metal airplane, but put the wooden wheel in the center instead of the front. It may be worthwhile to try to unbalance the weight, overloading the rear of the plane. Using the TNT to push the plane up may be necessary.
If you have a different strategy for completing this level feel free to leave a comment below.