From MangaHelpers:
Hagoromo Maki is going to an all-girls high school, a special one that allows its students to commute by plane. She and her first friend at school, Hasegawa Motoko, have found a plane and fixed it up for themselves to fly! However, it turns out that it was the plane used by a legendary pilot who protected the airspace for their school, and their school's ace pilot does not approve of them having it. Will Maki be able to fly and protect the air for their school?