I have some upcoming flights on AA that are operated by SkyWest that were in the valid range for AS accrual when booked, but were changed to invalid range (was 59xx now 60xx). Route is IAH-LAX.

Here's the kicker, AS puts their code on some of these flights, yet they claim these are still ineligible for accrual if booked as AA, per 2 emails to MileagePlan.

Is CS just wrong here, or is this for real? It's a partner for codeshare purposes, but not a partner otherwise?

The flights were always SkyWest, so it appears they just added flight numbers as AA has grown.