Transit through Vancouver International (Round trip US-India-US) [duplicate]

I would like to fly round-trip from USA to India via Vancouver International and back, on a flight operated by Air Canada (code sharing with United Airlines) in Oct-Nov 2019. I hold a passport from India and a valid multiple entry Canadian Visitor's visa.

Would I also need to apply for a Canadian Transit Visa in addition to the Canadian Multiple entry Visitor's visa I already have in order to transit via YVR (layover less than 48 hours)? Or is the Canadian Multiple entry Visitor's visa enough for the transit?
Is a layover time of 1h 35m typically enough to go through Canadian immigration at YVR and board the onwards Air Canada flight back to USA?

Thanks

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Do you go through customs twice on connecting flights?

You only go through once. If you connect through another country, you will just have to go through security and not customs. Incorrect, it all depends on the country and the airlines you're traveling with. Remember customs and immigration are different things and in some cases you'll clear then in different airports.

Do I have to go through customs for a connecting flight in Vancouver?

Passengers connecting to U.S. flights may use the U.S. connections facility. * Passengers will go through security screening and U.S. Customs, before proceeding to their next gate.

Do I need transit visa for USA from India to Canada?

You need a transit visa if: your international flight stops at a Canadian airport on its way to another country. you'll be connecting between 2 international flights at a Canadian airport. you'll transit through Canada in 48 hours or less, and.

Do I have to go through security again for connecting international flight?

Yes, a security check is mandatory when you take a connecting flight. This is because there is a time lag between getting off one aeroplane and getting on-board another to reach your destination.

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