flew over 是 fly over（飞过）的过去式
flight over,没这个词组,一般不这么搭配新概念2第43课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 他的飞行 在北极上空，意思是他在北极上空的飞行。这里fight是名词， over是和the North Pole 搭配的