Originally Posted by
Ditto
And where is it you are looking?

AF website shows the fare rules which includes the fare class as well
I'm not so sure. This is for a JFK-ZRH itinerary in a couple of months:
Fare code (1st letter is the booking class) : Code ALXP62US/ ALXP62US/ ALXP62US/ ALXP62US
Seems to imply all legs book in A, but for a through fare on JFK-ZRH the fare basis code would be the same for JFK-CDG and CDG-ZRH even if they booked into different inventories.
ExpertFlyer's booking class table shows that it
should book into W:
Code:
VIA AF W REQUIRED WHEN OFFERED A- FARES WITHIN EUROPE
But I'm not really sure if there's any way to verify, short of talking to AF or a travel agent.
ETA: Ok, it should actually show you on the eTicket receipt generated by the website; I have an F booking and it's showing that booked into J on the intra-Europe segment.