Air Canada at MDW

Last night, I noticed this flight inbound to MDW, but for whatever reason, I really didn’t think much of it. Then this evening, while driving by MDW, I saw an Air Canada tail and made the connection. It wasn’t parked at a gate, but rather, it was parked on the general aviation side of the airport. As far as I knew, I didn’t think Air Canada flew into MDW? Can anybody explain this flight and its history?

flightaware.com/live/flight/ACA7 … /CYUL/KMDW

Montreal Canadiens were in Chicago loosing.