Ms SWMBO Stanbury (spouse of Stanbury) passed 1M on AC 900 (YUL-AMS) during the night of Sept 1/2.
No on board ACK of any sort.
Her comment was that some sort of acknowledgement would have been nice, but ... this is AC after all! She did get an e-mail a few days later.

Would be grateful if "this momentous achievement" (I quote) could be added to the WIKI -- thanks.