flew over 是 fly over（飛過(guò)）的過(guò)去式
flight over,沒(méi)這個(gè)詞組,一般不這么搭配新概念2第43課In 1929 three years after his flight over the North Pole ,the American explorer R.E .Byrdsuccessfully flew over the South Pole for the first time.his flight over the North Pole 他的飛行 在北極上空，意思是他在北極上空的飛行。這里fight是名詞， over是和the North Pole 搭配的