Thank you for sharing the wiki. Curious about the following two scenarios:

• When booking codeshares, it may be impossible to know the operating carrier's fare class. For instance, the AC website may sell you UA's EWR-CHS flight as "AC5678" and show you an M fare when you select Flex. But you may actually be actually be booked on a UA Q fare and only earn 75% miles
• When booking AC flights through a partner airline, you may not know the fare brand (Flex, Latitude, etc). United might show you an H fare on YYC-EWR, but this could map to Flex, Standard, or Comfort, and your earning would be impacted accordingly

Is it really impossible to know the operating carrier's fare class when booking a codeshare via AC? It seems like a gamble at this point to earn SQM on partner airlines.
Would it make more sense to book directly on the partner airline's website if we are not looking for SQD? The AE Travel Partner website has a nice breakdown of the eligible fare class eligibility and fares might be cheaper on the OAL website compared to AC.