This was an interesting little experiement to look at. I did note that all of the Boeing aircraft have the same angle on the back of the their tails, and the Airbus have the same angle on theirs, albeit different between the manufacturers...
The angle on the front of the tails is the same for both manufacturers, with the exception of the 748, which is odd to all (but same beginning point as the A388...)
Perhaps I will try the same with the wings!