Originally Posted by
xaftas
What would be the cost if you booked Economy cash fare and then upgrade with miles?
I am not sure if Aegean/*A follows this rule, but in QR if a flight is available for an award, it is also available for an upgrade.
This way, you get some extra miles/tier points and also avoid the surcharges.
In *A upgrade from Y to C is only available for some fare buckets, the flexible ones. So usually you need to buy a fully flexible economy fare which might be too expensive to be worth it