Lessee here. So due to an amazing coincidence...during the short time that one pilot is out of the cockpit, the other pilot has a medical emergency. Dies or is incapacitated. And due to yet another amazing coimcidence, the door is locked without the other pilot having a key or access. And due to yet another amazing coincidence, just before becoming incapacitated, communications from passengers are shut down. And due to yet another amazing coincidence, the plane is taken off autopilot and makes a descent into a mountain.
What an amazing set of coincidences!
About as likely as there being a conservative working in the West Wing at the Obama White House.
No more amazing than a Kenyan Muzzie being elected President of the US twice.