Landing in Istanbul at 7am, the missing Bradford family had all day to make their way south to the Syrian border.
Clearly, they went to some lengths to cover their tracks and leave as little a paper trail as possible, before and after the flight.
The authorities will want to know who recruited them and when - perhaps it happened in Saudi Arabia.
Perhaps 12 days of strict religious observance on pilgrimage in Medina, Islam's second holiest site, left them extremely vulnerable to the recruiters of the Islamic State.
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