OK Allan, I'll give it to you, even though the geographical name is clearly nothing to do with 747s! You have certainly decoded the puzzle. <img src="graemlins/goodwork.gif" border="0" alt="[Good Job]" />
The answer to question 13 is
The Tropopause.
The lower layers of the atmosphere are called the troposphere. This is where all our weather takes place. As you rise from the earth's surface, the temperature falls on average by about 2°C per 1000ft. At a certain altitude, the temperature stops falling, remains steady(ish) for a bit, and then starts rising again as you move into the area called the stratosphere.
The average height of the tropopause in the temperate zones is about 36000ft (11km). Its average temparature approaches -60°C. It's lower and warmer at the poles; it's higher and even cooler at the equator.
The "life on the wing passing through to warmer climes" is of course medium and long haul aircraft, full of people, which usually cruise in or around the tropopause. It's vast because it encompasses the whole earth and is actually slightly bigger than the entire earth's surface.
Question 14 is yours Allan.