I will be flying from Iceland to Los Angeles. The first part of my trip is from Reykjavik to Toronto, with Icelandair, and the second part of my trip is from Toronto to Los Angeles, with Air Canada. I wonder if I need to take my baggage, go through customs, and check in my baggage in Toronto.
Yes, you need to do a whole nine yards, Canada Border Services, Claim Baggage, Check-in, Baggage Drop-Off, Security, U.S. Customs & Border Protection (since it's a pre-clearance airport). It'll be a lot of fun (not).