Last week I flew business class from YYZ to WAW using Aeroplan points. My booking never showed up on LOT website, but was accessible on AC. When I contacted LOT they said it will appear 24 hrs before departure for online check-in. This was indeed the case and using AC booking number I was able to check-in and select the seat I wanted. I will be returning with LOT and AC and hope that this will also work smoothly. As an aside - three seats in business class were broken and out of service.