Object in different positions in the frame.
Positioning of the subject in the frame can certainly affect the feel of the photograph (I lack the required artistic vocabulary to describe this better!). In these particular images the aircraft is facing in one particular direction and this influences the how the image might be read. It can only really move from right to left (or down) and this affects which placements work and which seem odd. I find this aspect of framing quite interesting particularly with a single subject in a plain background. It brings in the idea of negative space as well as potential external influences on the subject which aren't captured in the image.