I just replayed that part.
Be sure that you had Amanda open that valve by the rotor.
Then as Carl (picture at bottom right I think is Jack) move the left twice and the right once.
Then automatically, Jack will ask to move it closer so that he can board. No picture at bottom right now.
Automatically Carl will move the ship closer.
Now you get Jack to go to the airship.
Remember that the picture at bottom right is NOT the active character. It is the character that you might want to choose.