Bad Piggies Flight in the Night Level 4-31 can be three starred using a single contraption, but may require a few tries and our video uses two different contraptions. The general vehicle features a vertical column of metal boxes with balloons on top. Below the column is wooden boxes with TNT within. Springs can help aim the drifting structure toward the two star boxes.
If you have a different strategy for completing this level feel free to leave a comment below.