This thread reminds me of a situation I had with an Air Europa flight being sold as business class when there was no business class (or even any distinct premium seats) on the aircraft. I forget the details now of how it was ticketed (AF stock? codeshare?), but for the BCN-MRS flight, they told me that business class just meant that I got lounge access. Since I would have had lounge access anyway and wasn't planning to spend much time in the lounge, I certainly wouldn't have booked that segment (of a multicity trip) as business class, although I did pick Air Europe because it was the only nonstop available.