On August 1, American Airlines will change to a revenue based loyalty program. This means that instead of earning miles based on distance flown, passengers earn miles based on cost of the ticket. American is partners with Alaska Airlines. To many it seemed inevitable that there would be changes to the structure of earning Alaska miles on American flights. Today Alaska announced changes in earning levels that will go into effect for travel starting on August 1.

Economy

O, Q – 25% mileage earning
N, S – 50% mileage earning
G, V – 75% mileage earning
M, L, K, H, Y – 100% mileage earning
Business

I, D, R (?) – 150% mileage earning
J – 200% mileage earning
First

A – 150% mileage earning
F – 200% mileage earning

http://singleflyer.com/2016/06/27/ch...rican-flights/

Edit: Looks like Alaska's website is now updated: https://www.alaskaair.com/content/mi...-airlines.aspx