I suspect that CBSA does in fact connect your U.S. passport to your Canadian PR.Thank you for your response. I need to fly into Toronto. I know in Toronto airport they have eGates there which US passport holders can use. Any idea if the questions in the kiosk can detect past Canadian PR status even if that was granted when I was citizen of a different country? So my US citizenship/passport was never linked to my Canadian PR. The PR card expired back in 2018.
If the airline finds out that you are a PR of Canada, they could ask to see your PR Card before boarding, even though, as mentioned, most U.S. citizens are not asked.