Canadian airline WestJet has just announced that two passengers who were on one of its planes have tested positive for the 2019 novel coronavirus.

The travelers were aboard WestJet flight 1199 from Phoenix to Toronto on February 28. The carrier has officially advised any passengers that were on that same flight to keep an eye out for symptoms of COVID-19, and has asked that those who were seated in rows 18-22 immediately self-isolate and call Peel Public Health.

It appears that the two patients in question are the same couple from the Grand Princess cruise ship who were recently confirmed by the provincial government as being among the latest group of cases of the illness in Ontario, and who were both assessed at Trillium Health Partners Mississauga Hospital. 

The Ontario tally for the communicable disease has now reached 28, four of whom have recovered, with 72 additional people currently under investigation.

Within Canada, there have been 53 confirmed cases thus far: the 28 in Ontario, 21 in B.C., three in Quebec and one in Alberta. Most have presented with mild symptoms and did not require hospitalization, so they've been sent home to recover in isolation.

Flight details about other newly-diagnosed patients in the country, most of whom recently returned from international travel, have yet to be released.