The cheapest flight I could find for YYZ to LGA is through American Airlines in S class. I am a member of both AAAdvantage and BA Executive Club. I would rather accumulate BA miles, but in the past my mileage has been cut for discount fares on BA. I noticed from the AA site that S class still gets me 100% mileage for Advantage--can anyone confirm this? If I choose to collect BA miles for an AA flight, will they keep it at 100% mileage flown or do they decrease the number like they do for discount BA flights? Thanks.