Those who flew Air Canada from Florida to Toronto last week may have been exposed to COVID-19.
Date of flight with covid-19 case on board
Passengers in rows 26 to 32 may have been exposed to the disease on flight AC911.
This flight is among dozens that landed in Toronto last month with confirmed cases on board, domestic and international.
These include planes travelling from Paris, London, New York, Frankfurt and Chicago and several other cities.