If your checked baggage has been missing for more than 21 days, you should replace its contents, and the suitcase.
Proof of Financial Loss
Ask for an itemized receipt for each item that you replace (if possible), and keep your receipts. If receipts are not available, keep detailed notes of your purchases (date, description, and amount).
Liability Limits
The airline is liable for your expenses caused by loss of your baggage up to a certain amount:
CAD$1,500 on Air Canada,
CAD$1,800 on Porter, and
CAD$2,100 (approx.) on WestJet
You can claim more than these amounts if you can prove that the loss was a result of willful misconduct of the airline and/or its agents.
If the airline refuses or ignores your claim, then you need to enforce your rights by commencing a legal action within a specific amount of time of your flight. The limitation period is set out in the applicable provincial statutes.
If you miss this deadline you lose your right to compensation.
Where and How to Commence Legal Action
You may choose between numerous venues for suing the airline, including:
The province where you purchased the ticket.
The province where the final destination on the ticket is located.
The province where the airline has its principal place of business.