The flight from Barcelona to Singapore was just about to take off from the runway when SIA chief stewardess Serene Koh was alerted to a passenger who had suddenly become unconscious and was slumped in his seat.Koh immediately checked on the 71-year-old passenger and found he had no breath or pulse and was unresponsive.With help from leading steward Idris Abu,... The flight from Barcelona to Singapore was just about to take off from the runway when SIA chief stewardess Serene Koh was alerted to a passenger who had suddenly become unconscious and was slumped in his seat. Koh immediately checked on the 71-year-... [2557 chars]