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  1. My sister is flying (fly) home from London today. Her flight will arrive (arrive) in an hour so I am leaving (leave) for the airport right now to get there in time.

Why Will arrive and not arrive because the arriving of a flight is something schedulde, so present will be better

http://www.ndj.edu.lb/sites/default/files/images/import/grade-9-all-tenses.pdf

  • Because you are not talking about the schedule. Just because it is scheduled to arrive doesn't mean it will arrive. – user3169 May 21 '17 at 5:39
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Her flight arrive in an hour

sounds just plain wrong. However,

Her flight arrives in an hour

is an OK alternate (present tense) way of saying

Her flight will arrive in an hour

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