Taking 'Three of the flights had actually taken off within 10 to 15 minutes of their planned departure times.' as a given, does it logically imply 'Within 10 to 15 minutes of their planned departure times, three of the flights had taken off.'
Three of the flights had actually taken off within 10 to 15 minutes of their planned departure times.###Within 10 to 15 minutes of their planned departure times, three of the flights had taken off.