If one is travelling by plane on a flight that is more than 7 hours, he should pray on it right?

If so how do I pray? Does it suffice in me asking the pilots the direction towards Mecca?

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Yes one must pray on the airplane if by the time he arrives his destination the time for prayer will have expired. You can do the following:

1- Ask for the direction of Mecca. Usually you can figure that out from the flight route map shown on the screen.

2- If you can, find a corner and stand up and pray with full ruku’ and sujud.

3- If you are unable to do so, pray in your seat but try to face Mecca.