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What puzzles veteran crash investigators is why the crew never radioed a mayday. >> they didn't provide a stress call. they didn't indicate in anyway shape or form a problem with the aircraft. that's very unusual, given the fact that they were 38,000 feet. they would have been in complete communication with air track control. >> reporter: among the scenarios verdicts will have to consider, was there an emergency to force a rapid descent, if that was the problem the pilot should have levelled the plane out at 10,000 feet where there is plenty of oxygen. instead, it kept descending. so were the ...

Problem with the aircraft. that's very unusual given that they were at 38,000 feet they would have been in complete communication with air traffic control. >> reporter: among the scenarios investigators will have to consider, was there an emergency that forced the crew to program a rapid descent, a fire or smoke or sudden loss of cabin pressure? if that was the problem, the pilots should have leveled the plane out at 10 sthou feet where there's plenty of oxygen. instead it kept descending. were the pilots and passengers somehow incapacitated perhaps from lack of oxygen. captain john cox once...