Originally Posted by
NoWindowSeat
Different airlines, simple as that. Same like a pepperoni pizza, restaurant A can charge you 8€ and restaurant B 25€.
I'm not aware of a restaurant which sells its own pepperoni pizzas for 8 euros and another restaurant's pepperoni (branded as the restaurant's own pepperoni pizzas) for 25 euros. Usually restaurants do not engage in this codeshare business where you put your own brand on someone else's product.