SWH, I think Frank an Aroa have a case in regard to photography and one or Two other matters..
Still a private operation, see CAR 2 (7)(d)(v) "the carriage of persons or the carriage of goods without a charge for the carriage being made other than the carriage, for the purposes of trade, of goods being the property of the pilot, the owner or the hirer of the aircraft"
Is information acquired a "good for the purposes of trade"?
If someone gives Joe the photographer a memory card, and Joe flies off and fills it with images, and then returns it, exactly what "trade" has taken place?
Similarly, if I take Fred the Real Estate agent for a flight to look at some properties from the air, what "goods" have changed hands?