请问 He flies__speaceship everyday。中的空格部分应该填什么介词？

the 本句的意思可为：他每天都要驾驶太空船（在太空中飞行）。

fly可表示drive a flying object.例如：
He is a pilot.He flies planes as a living.
My family had a good time by having a picnic and flying a kite by the lake last Sunday.

into

by 表示交通工具的使用方式

on