A loss of cabin pressure that incapacitated the cockpit crew appears to have been the cause of Sunday's crash of a Helios Airways 737-300 into a mountainside north of Athens, but investigators still have at least two mysteries to solve: What caused the aircraft to lose pressure and why were the pilot and copilot apparently unable to don oxygen masks and bring the aircraft to a survivable altitude before they were overcome from lack of oxygen? All 121 persons onboard the aircraft were killed ...

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