I was just reading an article about this and saw the following ...
The workers handle baggage and cargo, tow planes, clean cabins, and perform flight operations tasks for more than 30 airlines, including British Airways, Air France, Lufthansa, Emirates, Sunwing and Air Transat.
Air Canada said it won’t be affected by the strike as it operates its own baggage handling, and WestJet won’t, because it uses a different company.
And it won't affect Air Canada because ... they don't clean their planes anyway?