Some people claim these were merely fish. I personally find that hard to believe. Someone built one of these things in paper airplane format and it actually flew. Now, I will watch this video:
Some of the objects in this video do look like fish, but notice that the fins are curved. The "jets" above have straighter fins and objects attached to them that no fish would ever have.
Also, failed logic with the above debunker:
If all the other objects "clearly" show what they are (fish, frogs, etc) then why, suddenly, wouldn't these "jets" be clear indications of flying vehicles? Why would they suddenly make an obscure object that nobody can understand when clearly they've tried to mimic the reality of the objects and creatures?
Ok, there ARE two headed creatures, but think about it. Although rare, a two headed creature CAN be found in nature occasionally.
I do have to admit, though, that the sucker fish explanation does make sense. BUT I find the model pretty cool..so.... I'm still on the fence.