The Joyful Descent

On a perfectly clear afternoon, a fully loaded commercial airliner circled over a mountain range for six hours before finally plunging into the earth. The black box recordings revealed something chilling: there was no structural damage, no engine failure, and no distress call. Instead, the final hours of the flight were filled with the echoing sounds of passengers and crew laughing, singing, and cheering wildly right up until the moment of impact. Why did it crash?