While traveling East wards by plane, salaah times approach very quickly. How am I supposed to perform my Salaat?

Answer: When a person is travelling eastwards then as Salaah time’s approach, he/she should perform his Salaat regardless of how many he/she has to perform. Salaah times may be determined by the rising and setting of the sun and by information gained from the cabin crew. When a person is travelling westwards (thus, he is gaining time/the day is being lengthened so to say) and he is faced with the situation where within twenty four hours he is able to perform five Salaat (by observing the normal times such as Maghrib after sunset, etc.) then he should do so. However, if within twenty four hours, he is unable to perform the five Salaat observing their normal times, then he should estimate the approximate times between Salaah’s under normal circumstances and accordingly observe his Salaat. (Ahsanul Fatawa vol 4, pg 71)