Originally Posted by
f4free
In my experience Swiss sells flex fares as free change but then closes inventory available for new tickets for yours when rebooking.
They will sell a new A fare but when you rebook from within your PNR A goes to 0 and you are forced to pay up to F..
HON Circle just warned me of exactly this regarding two A-First Flex tickets I was about to buy. For my city pair, A is about half the price of F. They said the forced repricing into F didn't always happen, but often happened.