From this website:
"There may be quite a mundane explanation at hand, athough it involves a little bit of knowledge about the Egyptian culture, its writing system and the well known tendency to "correct" (alter) previous inscriptions whenever a monarch desired to do so. Plaster mixed with a pigment to match the stone color was an ideal material for modifications.
And they just happened to line up perfectly with the ones that are already there?
Not much of a reason to do the corrections otherwise, no?
Not a chance.
What?
Not a chance at ALL?! It MUST be a helicopter, despite the fact that there are no other similar carvings to be seen anywhere? Don't you think this would be interesting enough to make all kinds of carvings?