Hmm, Obviously law varies from country to country... but presumably the basics of it is...
- If you want to fly with someone, and they want to pay "fuel money" it is ok, providing it is only offered to club members, friends, family, etc, decide how friendly PPRuNe members are too you
.
- If you want to fly someone, somewhere where they pay for you to do so, it is illegal.
- If someone advertises that they want to go somewhere, and it is not on the basis that you are also covering your share of the costs, it is illegal.