What you need is a ball pen and a set square...
hold on it's just the beginning!
you can use what ever ball pen you like
i prefer a "Bic" because it has a more streamlined shape.
Make sure that the ball pen has a clip (or whatever that's called),
It is crucial for the further manufacturing of your awesome little plane!
now take the set square and hold it with the biggest side to the point of the ball pen
put the set square on the ball pen an try to put the ball pen in the middle of the set square.
push the set square between the pen itself and its clip (or...whatever it's called)
now your awesome little plane is almost finished.
The last step is very important.
close your eyes and imagine the awesomeness!