Given the statement 'That nine minutes' notice before impact was the most the military would receive of any of the four hijackings.', is 'The military had  notice of the hijackings hours before they impacted.' neither a logical follow-up nor a contradiction?
That nine minutes' notice before impact was the most the military would receive of any of the four hijackings.###The military had  notice of the hijackings hours before they impacted.