It's a Bird...It's a Plane...It's...

I made this scetch last week. It started off being some kind of submarine , perhaps because of the shark looking fins?.. Well, after adding a couple of advanced engines, some contrails and some dark clouds, the submarine turned it into a airplane, or spaceship....
... No, gotta be an airplane (no contrails in space).... too small wings to be flying in earth athmosfere though... well, it´s just a scetch ;-)