Here is the sentence:
Are we suddenly see a dozen or more sailing in the clear blue sky?
I have a bet with an editor that this sentence has a mistake, and it cant't be correct in this writing. I think there must be Are we suddenly seeing.
But my opponent declare there are invisible commas in it, and it must be interpreted like:
Are, we suddenly see, a dozen or more sailing in the clear blue sky?
So, it's a parenthetical clause that we can throw out and the sentence will not lose its meaning.