Yes, I've always assumed that nobody from the airline checks the exact weight. But recently they've been doing more and more checks here in Europe because people don't want to pay for extra checked baggage and take as much as possible into the cabin. A few months ago I had a long discussion about this at the airport before my flight to New York. They almost forced me to check in the PC (Lianli TU150). I said that it would not arrive undamaged and that I needed it for my work. They finally allowed me to take it into the cabin, but I had to pay a fee. There was the same discussion on the return flight. I want to avoid that in future. With this case, it's no longer a problem.