Thanks for sharing, but really – after looking at that I have to ask who was the one responsible for the “UFO” tag to begin with. Given the speed, and the vapour trail being exactly like the F-18, I cannot see it being anything else but manmade, in fact, US made and they are practicing formation flying etc. It clearly looks like a drone from the starboard vantage point!
映像を見た米国のNARCAP仲間の書き込みです。ここで言う「UFOタグ」とは飛行機雲状のものを指すのか、よく分かりません。