According to the commentary, this is original design for a War Thunder doujin (seriously) name literally translate to "War Princess Thunder" Edit: its called "Bellona Thunder", from the cover of the book
PlaneGirls was a thing on Pixiv several years before KanColle. I was kind of surprised it didn't take flight (pun intended) before Kantai Collection. Or who knows. Maybe Shipgirls were already all the rage there, but I wouldn't recognize them over ordinary mecha armaments, unless their appearances would be limited to that of Mami 19 from Cho Aniki. A grossly neglected shipgirl here.