If you're starting in YYZ, then according to this page, yes
https://www.americanexpress.com/ca/e...ional-airport/
For MLL elsewhere, refer to this page
https://www.aircanada.com/ca/en/aco/...f-lounges.html
As a Cardmember, you may access the Air Canada Maple Leaf Lounge upon presentation of your eligible American Express AeroplanPlus Card and a confirmed, same-day departing ticket on a flight operated by Air Canada, Air Canada Rouge or under the Air Canada Express banner.
Also applicable on same-day departing Air Canada codeshare or select Air Canada partner airline flights. Not valid in conjunction with an airline employee travel ticket or an airline partner pass travel ticket.
Fee for each paid guest:
- Frankfurt lounge: €29.75 (EUR)*
- Paris lounge: €30 (EUR)*
- London Heathrow Departures lounge: £25 (GBP)*
- All other Air Canada Maple Leaf Lounges:
- Before 11 am: $20.00 - $24.00 CAD/USD*
- After 11 am: $30.00 - $36.00 CAD/USD*
* Fee is inclusive of the minimum (0%) to maximum (20%) tax which may apply, based on your itinerary.
View more complete terms and more information on Air Canada benefits.