Originally Posted by
RedChili
I had a ticket with TK a couple of years ago which booked directly into J. It was a very cheap ticket, so maybe the underlying fare was an economy with an upgrade to business. But I booked it on the TK web site and chose business class, so for the customer, it appeared to be a regular business class ticket.
FWIW TK do refer to J class as a business upgrade. I don't usually care as the mileage difference is not great but the cost can be often around €250 on a return from LHR - Turkey.