Okay the plot thickens...

I eventually got AC to confirm both our seats in I for that segment.

Now a new issue. AC canceled the ATL-YYZ flight and USDM rebooked us on one that departs even before the SFO-ATL flight departs. There is no suitable ATL-YYZ replacement. How to proceed from here? Ideally they'd rebook us on AC SFO-YYZ directly but with the switch from *A to OW I'm not sure how easy that would be.

BIG wish would be to get SFO-CTL-CDG or SFO-PHL-CDG on US metal. Not sure how easy that would be either.