The flier is flying a new-type jet plane on trial.

飞行员正驾驶一架新式喷气机作试验飞行。

Jets coursed the area daily.

喷气机每日飞经那地区。

Iraqi security forces were placed on high alert and American aircraft —unpiloted reconnaissance drones flying low, and fighter jets roaring high above —crossed the capital.

伊拉克安全部队处于高警戒状态，军首穿梭，无人驾驶侦察机低飞行，战斗喷气机高呼啸。