Why did AirAsia Flight QZ8501 crash into the sea while the seven other planes flying nearby eventually landed safely?
That's the big question on the mind of Indonesia's Transportation Minister as investigators finish preparing the initial report into the crash last month of the Airbus A320-200 with 162 passengers on board.
"The question is why this plane suddenly climbed" from 32,000 feet to almost 38,000 feet "without any information and any warning," Ignasius Jonan told CNN in an interview Monday.