Economy to Premium Comfort: typical upgrade cost
I am flying AMS-LAS in a couple of weeks in a 787-9 in Economy class.
I have just decided I don't fancy over 10 hrs at the back in 9-across Economy. But I should have options to upgrade at check-in.
How much might it cost me to upgrade to the 7-across Premium Comfort cabin?
Note that I realise the AMS-LAS is a popular flight and it is possible that there may not be any free seats at all in Premium Comfort.