Right ok heres another question, since parents can pay for their kids flight training, can a parent or any third party for that matter still pay for the operation of a plane if there are no other passengers or the person paying is not a passenger
61.113C says the pro rata share only needs to be split with passengers. Say I want to take my girlfriend up so I go to my dads hangar where he has already payed for fuel. Neither I or my girlfriend pay and its a pleasure trip. Is this ok?
No. Subsection C says:
"
(c) A private pilot may not pay less than the pro rata share of the operating expenses of a flight with passengers, provided the expenses involve only fuel, oil, airport expenditures, or rental fees."
So the flight with the girlfriend is a flight that has a passenger. Therefore you are responsible for at least 50% of the costs of the flight. That means 50% of the fuel consumed, 50% of any landing/ramp fees, 50% of the oil consumed. ANYONE can pay for your girlfriend's 50%. But, according to the regs, YOU need to pay your 50%. The reg doesn't say anything about splitting the costs only with people who are on the plane. Or that the passenger on the plane is necessarily responsible for ANY costs.
(c) says EXACTLY what it says. That YOU are responsible for YOUR pro rata share AT MINIMUM. Which in the case of a plane occupied by the private pilot and 1 passenger means you are responsible for 50% of the flight.
So if it is you in your private jet and it is you and your closest 19 friends going from LA to Cleveland for a pizza, you are responsible for, at minimum 1/20th of the costs of that flight. If ONE of the passengers wants to pay for the other 19 people on the plane, that's fine. But, YOU are still responsible for YOUR share.
Now, that being said, I have ZERO clue if there is a reg specifying how many people a private pilot can fly around. I do know, however, that barring any other reg, that private pilot would still be responsible for 1/20th of the expense of that flight.