noise
great thread, but one central point has been missed:
if it wasn't for silly people sueing everyone for "product liability", and the awesome type certification requirements,
we'd have engines (and possibly blades) that made our aircraft as quite as a Lexus. And they'de be a lot more economical to boot.
bet it's the same sort of people who start these petitions that are now whinging about the excessive noise we all make.
Big Ls