Remix of Flying Indoor Jet Glider v7 by https://makerworld.com/en/@EEEEEE

I've increased the size by 195% and reduced sparse infill to make it lighter.

Below build instructions copied from original designer's model, which you can find here. You should boost that model if you like this one.

Assembly

Start with the plane and wings like this.

Flip over the plane.

Insert the wing shown on the left into the slot on the left. There are two connection points on the wing, with a difficult to secure notch in the front and a relatively simple notch in the back. Start with the front notch, and then push down the back notch. The front might be easier to secure by placing the back half of the plane on a preferably soft surface, and then pushing down from the bottom of the wing. If the wing bends, just bend it back. Repeat for the right side.

After both vertical wings are secure, check the back(horizontal) wings and bend them back to a 90 degree angle if they were bent during the process. Fold up the elevators(located on the back horizontal wing) a little bit less than 45 degrees.