How do FBO's enforce ramp fees? I'm picking up a friend at a nearby airport that charges a landing/ramp fee if you do not buy fuel. I will have close to full tanks on landing, so I do not have room for fuel. I will stop briefly to pick him up and then continue on to our final destination. I called the FBO about the fee and after a brief chit-chat the attendant agreed to waive the fee because I was just doing a pickup and not parking, great! But it got me to wondering, how does an FBO enforce such fees? I know he can get my name and address from my N number. But without a SSN he can't do a collection. And what agency would take a collection action for $10? For background, the airport is uncontrolled and owned by the county(taxpayers). The guy who runs the place gets a sweetheart deal of $200/yr. lease. Basically, he collects all of the hanger/tiedown rent, all fuel profits and has a monopoly on maintenance. The county gets the $200/yr. I'm not looking to get into the costs and profits of running an airport, which if private I know can be meager. But how can he force someone after landing to pay up?