Hi there, I have a question and hope for help from some people very familiar with ITA Matrix.

`See attached screenshot. I have a segment LAX to HEL via JFK with AA and AY
How can I force A class for the AA segment LAX tp JFK and R for AY From JFK to HEL

I found something like this carrier.city1+city2.farebasis but I do not know how to use it and where to put it in.

Hope someone can help

Thanks in advance