Luckely on the back of the shirt there were 2 complete airplanes, because all the ones on the front are missing the tail of front, which I didn't notice untill I was home, lesson learned here! (I think I can unpick the pocket and use the one underneath later). I used iron-on Vliesofix on the wrong side of the fabric and cut out the 2 airplanes. (for some weird reason this photo keeps turning on it's side ?!?!).
I ironed them on the front of the red top so they won't shift while I sew them on. (you can still see the change of colour from the heat of the iron, it changes back after cooling down!).