When should the person who is travelling by plane break his fast?

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Check below answers in case you are looking for other related questions:
It is not permissible for you not to fast because of work
If he breaks the fast by eating during the day in Ramadaan so that he can have intercourse with his wife then he has to offer the expiation

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Related Answers:
Question from China about the time of iftaar
Did the Sahaabah (may Allah be pleased with them) fast on the day of Badr?
Their imam does not pray Maghrib in the mosque, so that he can eat iftar at home!
It is not permissible for you not to fast because of work
If he breaks the fast by eating during the day in Ramadaan so that he can have intercourse with his wife then he has to offer the expiation

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