Mike Exner, a prominent member of the Independent Group, has studied the radar data extensively. He believes that during the turn, the airplane climbed up to 40,000 feet, which was close to its limit. Exner believes the reason for the climb was to accelerate the effects of depressurizing the airplane, causing the rapid incapacitation and death of everyone in the cabin. The cockpit, by contrast, was equipped with four pressurized-oxygen masks linked to hours of supply. Zaharie was often lonely and sad. His wife had moved out, and was living in the family’s second house. By his own admission to...