How does Gilgamesh have a futuristic fighter plane?
This "airplane" is the Vimana. It is recorded in several epic Hindu texts, including the Ramayana and the Mahabharata. In fact, in the original Sanskrit works, there is more than one vimana, but in any case it is a flying contraption that gods would ride. There is no record of them in Babylonian literature as far as I know, but of course Gilgamesh owns the prototypes for all of the technology that appeared in later cultures, which presumably includes this.