Canada Stocks Market

Air Canada, three types of actions, what is the relationship between them?
In the Canadian market, with the ACA and the cab on the market U.S. AIDIF. How to understand this? Above all, how to understand two stocks in the market? Thank you.
There may be different categories of stocks. The Class A shares may be non-voting and Class B voting shares can be. The actions of the United States could be an ADR (American Certificate of Deposit).
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