Looks like a hypersonic wave rider to me.
Waveriders:
https://duckduckgo.com/?q=hypersonic+wave+rider&t=fpas&iax=images&ia=images&iai=http%3A%2F%2Fwww.aerospaceweb.org%2Fdesign%2Fwaverider%2Ffigures%2Ffig24-2.jpg