An advertising apparatus for placement on a food cart or "duty free" cart permits the passenger to readily identify that "duty free" sale is taking place. The advertising apparatus also permit vendors and manufacturers of the "duty free" items to advertise their products directly on the cart for clear viewing by the passenger. It is further envisioned that the advertising apparatus may be mounted to the service cart at any time to enable third party advertising even when "duty free" sale is not taking place, e.g., during the distribution of food, snacks, meals etc. during the flight.