hush hush, I am not starting an Airbus-Boeing War, but that's just for fun for 'NG'.
Don't think too much about this wording, it really just for fun.
Actually I doon't like 737-300, -400 and -500 but I like the NG series. They look much better then -300~-500.
Again, don't think too much about the word 'NG'