Ruling for One Who Prayed Ẓuhr and ʿAṣr and Then Traveled by Plane

Answer—and Allah is the Guardian of success:
As for the prayers: if he reached Ṣanʿāʾ after the entry of the time for ẓuhr and ʿaṣr, and he had already prayed ẓuhr and ʿaṣr in Indonesia, he is not required to pray them again. But if he reached Ṣanʿāʾ before the entry of ẓuhr and then ẓuhr entered after his arrival, the obligation of ẓuhr and ʿaṣr is renewed for him upon the sun’s passing the meridian. It is as if the zenith that occurred in Ṣanʿāʾ were the zenith of another day, different from the zenith that occurred in Indonesia. This is preferable in my view.
As for fasting: while he is in Ṣanʿāʾ, it does not suffice for him to base his breaking of the fast on Indonesia’s sunset.
Yes: if Maghrib entered in Indonesia and the fasting person there broke his fast, and then the plane took off for Ṣanʿāʾ and arrived before sunset there, his fast for that day nonetheless suffices. And in the reverse case—if the plane departed from Ṣanʿāʾ at dawn to Indonesia and arrived there at sunset—the passengers break their fast when the sun sets, even if they have fasted only six hours, for they have fasted from dawn until night.
Likewise, if the plane left Indonesia before sunset bound for Ṣanʿāʾ and the sun did not set from the passengers’ view throughout the six-hour flight and they arrived in Ṣanʿāʾ before sunset—then whoever intends to fast must not break his fast until the sun sets in Ṣanʿāʾ. When it sets, he breaks his fast; and Maghrib and ʿIshāʾ are not obligatory upon him until the sun sets in Ṣanʿāʾ.
Source : Min Thimār al-ʿIlm wa al-Ḥikmah vol.1