If a traveller is flying west from New York to Hong kong for 16 hour and needs to Daven mincha on the airplane, which time zone should he follow?
Answer:
One should follow the time zone of the place over which one is flying at the time of davening.
See: Yerushalayim Be-Mo’adehah, p. 232, in the name of Rav Shlomo Zalman Auerbach; Iggros Moshe, Orach Chaim Vol. 3, no. 96.
This a great website that provides in-flight zmanim https://www.myzmanim.com/airdemo.aspx . It uses advanced aircraft tracking technology, to provide in-flight zmanim based on actual flightpaths collected from previous flights.
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