There's always the mystery of the Blue Water (why is it blue?), and why you're not allowed to carry mercury on a flight (though that's metallurgy, and I've never been sure whether metallurgy is physics or chemistry).
Seriously, I think the emissions side of things would be most interesting. All that stuff being injected directly into the stratosphere -- how willing are we to examine the problem soberly?
About the crazing on the windows: someone told me that this was also related to high-altitude pollutants. Anyone know about that, or was it green propaganda?
R