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Olympics planners, on the other hand, are confident that transportation will be successful.

U.S. military planners have long been concerned about Iranian naval attacks using small boats for ramming or small arms attacks against shipping in the Persian Gulf.

For Israeli military planners, this has been a long time coming.

Mrs Underwood's mother had arranged the surprise drone show with help from the couple's wedding planner – who had suggested it as a "wow factor" component of the day.

Organisers can predict which areas are likely to be busiest by tracking the most popular artists among fans who use the festival app's schedule planner.