Fold a piece of paper in half vertically

Unfold the paper and then fold the top two corners inward so they meet along the middle crease

Fold the point down until it looks like sn envelope

Fold corners in 2/3 down to the center of the crease

Fold up the point so that it secures the flaps against the crease

Fold the paper in half along the original crease so the folds are facing outward

Fold both side flaps down to the bottom so the wings are perfectly aligned with the bottom of the airplane

Unfold

Then let it fly and try again

This time it should fly!!!