The screenshots of an aircraft that show up in the selector are supposed to be taken in the hangar view, by clicking on the button in Dev Mode. (And then some magic makes the actual hangar disappear and uses only the camera position, angle, and field of view that are current when you click the button, so the photo ends up being taken against a blank background.)
But what if your aircraft is so large that none of the views from the front show all of it? (Only the view from the back shows the whole of my aircraft.) Is it possible to edit the camera positions used for the "tracking shots" in the hangar?