Re breaking one’s fast on the plane.
Even though the the shkia is seen for a long time – does one break one’s fast according to the time of tzeis hacochavim of the place over which one is flying.
Yes. The time of nightfall depends on the place over which one is flying, and not on the seen shkiya on the plane (Yerushalayim Be-Mo’adehah, p. 232, in the name of Rav Shlomo Zalman Auerbach; see Iggros Moshe, Orach Chaim Vol. 3, no. 96).