Adding to the discussion on which conditions of carriage apply when you have a qantas code share or interline ticket.
Section 4 of the QF conditions of carriage spell this out (see 4.4.1(c) and 4.4.2)
4.4.1 Codeshares
(a) We have arrangements with other Carriers known as 'Codeshares'. This means that even if you have made a booking with us and hold a Ticket for a flight with a QF Airline Designator Code, you may travel on an aircraft operated by another Carrier.
(b) If such arrangements apply to your flight, we will advise you of the Carrier operating the aircraft at the time you make a booking.
(c) The conditions of carriage of the operating Carrier will apply to all operational and procedural aspects of the flight such as, baggage acceptance, check-in and boarding, refusal and limitation of carriage, conduct aboard aircraft, and schedules, delays and cancellation of flights, and these may differ from these Conditions of Carriage. You should check the operating Carrier’s requirements for:
(i) re-confirmation and check-in;
(ii) the types of baggage that will be accepted;
(iii) the cost of additional Baggage Allowance;
(iv) the purchase of additional Baggage Allowance only at the airport of departure for that flight and not in advance;
(v) schedule changes, delays and cancellations; and
(vi) refusal of carriage and denied boarding.
(d) Your Baggage Allowance is determined according to your itinerary and each Carrier involved in your journey. If you have booked your flight directly with Qantas, you can view your Baggage Allowance when you select your flight on qantas.com and continue to the ‘Options’ page. Once you have booked your flight, you can also view your Baggage Allowance in Manage My Booking by selecting ‘View Allowances.’ If you have booked through a travel agent, please contact them directly for your Baggage Allowance.
4.4.2 Interline
We have arrangements with other Carriers known as an 'Interline.' Where there is an Interline, this means that even if you have made a booking with us, the Ticket we issue you will be for a flight operated by another Carrier using that Carrier’s Airline Designator Code. If we issue an Interline Ticket for you we do so only as agent for that Carrier. The conditions of carriage of the operating Carrier will apply to that flight and are available on the operating Carrier’s website.