[zipper]

You cite two examples. I can give you more where no call was made.

How about another example of one that flew for 7 hours after a fire?

Anyway I agree this is all speculation. This story is already 'stranger than fiction'.

[Tzfat]

If the fire was electrical, it is highly likely it was extinguished by isolation procedures - and if the smoke was heavy enough, or if the crew did not don masks, in a timely way, the aircraft could have continued to fly after asphyxiation.

Having said that, I think the flight deck fire scenario is less likely than crew theft.