How was lobbying used?

lobbying is money.it's a advocacy to influence policy makers and persuade them

A model aeroplane is used for presentations and testing. Model planes are also used for fun. They are used model-plane clubs, aeroplane company headquarters and studios. (Bedroom, in my house)

That people wont work.

There still used for skating or you can give them to a friend for spare parts.

The only answer that comes to mind is "Airships". Hydrogen, the lightest element, was used in airships, where excess weight was undesirable. However, accidents like the Hindenburg disaster showed...