Non-smoking aeroplane

I was delighted to receive confirmation of a Qantas Link flight from Melbourne to Mildura on November 10, returning in the evening of the same day, to find in the official booking form a ‘non-smoking seat requested for Halliday/Francis James Mr’. It made me wonder whether this might be a very old aeroplane, something like Kingsford Smith might fly, but that’s not the case.