Having changed our LHR/JNB flight in a fortnights time from the earlier 789 to the later 380 my paid seat selection only allowed over the wing seats on the upper deck as all A/B and J/K seats had been taken in the forward cabin but I have regularly checked for quite some time now. To my delight i’ve just seen that 52A/B have opened up so I’ve changed to those. Any idea why that would be? Perhaps someone cancelled their flight. I’m happy anyway.