The Unchanging Plane

I've spent literally all day today in and around planes. Now, I consider planes to be something of a technological advance from say... the early 1900s. I think many would agree with me. Anyway, I realized something really strange... in my (short) life, planes have remained generally unchanged. Sure some big companies ate up smaller ones, but the planes themselves don't really seem to be advancing. Well, this got me to thinking about HOW planes could get better. And quite frankly, I can't think of a whole lot besides the obvious efficiency and comfortable-Ness factors. So, my question for the night: are planes done advancing? Will something new replace them, or will they get better?

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