Thank you. I think you have understood the situation. However, I don’t know if the Light fare was cheaper than the Weekend fare in this case, because I could not access the Weekend fare.

If I go through Google and click to AF, it still gives me the option of choosing higher Standard and Flex fares, so whether the Weekend fare is higher or lower than the Light fare, I would like to see what it is! Because the fare conditions are also different, and it is sometimes worth paying a bit more for the flexibility of the Weekend fare.

And in most cases (in my limited experience) the Weekend fare is the cheapest one, a few euros less than the Light fare. And I have this card, so how can I use it and also use the Google flights search engine?