I am booked (on BA stock) on BA1587, which is operated by AA (AA0138). Looking at the AS website, the BA flight number is not eligible for earning miles. Simple enough. However, the same flight, is eligible for accrual on Alaska based on the AA flight number. Under the accrual chart, however, it says, "To ensure flight credit, the two letter airline code (AA) must precede the flight number (for example, AA XXXX) on your ticket receipt or boarding pass." Since I'm ticketed on the BA flight number, does this mean Alaska will not allow me to accrue for this flight (since my boarding pass would presumably have the BA code - I haven't done a codeshare in awhile and can't remember what normally shows up); or would they look at the underlying operating flight (AA) and allow accrual?