Originally Posted by
xliioper
I'm guessing it's probably happened before. There definitely have been a number of cases of the opposite happening and agents mistakely opening the door for domestic arrivals with an international flight --
https://viewfromthewing.com/airline-...o-jfk-airport/
Obviously this situation would be a bigger faux pas than what happened to OP.
It's happened in the past at YVR with flights from Beijing and L.A., and passengers had to be tracked down by CBSA and the RCMP.