Comment Passenger can not influence destination ... (Score 3, Interesting) 269
A "share" of the cost includes all expenses of the flight. Rental, fuel, etc. The pilot and passenger must each pay half of total expenses.
The passenger can have no influence on the destination. If the pilot is flying from A to B and the passenger tags along, OK. But if the pilot just wants hours and goes to B because the passenger needs to go there then I think there is an FAA regulations problem and the FAA will consider the flight commercial.
That said I am not a lawyer nor a FAA guidelines expert. All I know is what my instructor told me many years ago in ground school. "The person showing you their FAA ID is never ever there to help you. Never hand your license to the FAA official to help them read / inspect it, that can be considered surrendering your license if the FAA official wishes to interpret the act as such. Keep the license in your hand and move it closer to their face if they are having a hard time reading it, pull it away if they reach for it. If they ask for it tell them you will be handing it to your attorney and they can speak with him/her."