Originally Posted by atcanobbio

per the link i initially posted:

"For flights marketed and operated by a partner (partner two letter code precedes the flight number), and booked on alaskaair.com, see chart below in Earning on Partner Flights booked via Partner Sites for mapping of fare class to cabin by partner"

So this tells me that both I and Y codes will be mapped as business, thus 250% earnings on the EI flights.