It's good to know that AS will accept DL-issued boarding passes. DL, on the other hand, does not seem to accept AS-issued boarding passes. On Friday, I overheard a DL GA announce that everyone needed a DL-issued boarding pass because those issued by other partners, notably AS and QX, would not scan. I also know that the DL kiosks don't allow you to scan AS-issued boarding passes to access your reservation.