Metasequoia Workshop Part 2:

The airfoil of the wing:

We create a primitive cuboid and "compress" it with "Increase/decrease" on the Y-Axis

Then we cut the cuboid with the "Knife" function as many times as needed.

We mark the points and decrease their distance on the Y-Axis like described above.

Downscaled it looks like this:

Now we move the point until the airfoil has its shape:

The airfoil is finished.