The Stowaway

The Boeing 767 300 took off shortly after 8AM local time.  The flight time was 5 hours and 15 minutes.

This means that the sun was shining on the plane for the entire flight.

The wings would be at fuel temperature for the entire flight. I don’t know whether the Boeing 767 300 uses fuel system heaters or has an icing inhibitor agent added at the point of sale when it refuels.

If the fuel system has heaters, the wheel well will not be exposed to temperatures below 32 degrees Fahrenheit.

One of the risks mentioned for stowaways in the Wiki article is heat from the engines.  The wheelwell of the 767 300 is located between the engine and the fuselage.

The incidents involving stowaways who fell out when the landing gear was lowered were stowaways on DC-8s, according to a CNN report shortly after 11:30PM April 21, 2014.

The experts who say the stowaway was exposed to the temperature at 37,000 feet are poor experts.