Check this out at cnn! passengers weight!
When I worked for an air charter service, we'd weigh everyone! We had a 'private' scale behind the desk to weigh shy women. It worked; they'd use it. Lying about your weight when traveling on small airplanes or commuter air planes can cost you your life---and that of the people on the plane with you.
Stick to your diet and be PROUD to hop on the scale!