I've successfully gone through YVR, Trudeau International and once I did it upon arrival at JFK. Both of those Canadian airports were quick and painless, JFK wa

I've successfully gone through YVR, Trudeau International and once I did it upon arrival at JFK. Both of those Canadian airports were quick and painless, JFK was a bit longer, a lot more questions and closer inspection of my application but ultimately a fine experience. The time I got denied (well, not denied, but refusal to process which I guess is better) was at a smaller land border outside of Vancouver. IMO, luck in getting the right agent plays a role. I was often very luck (after my first disastrous encounter), getting someone who was clearly in a good mood or had positive sentiments about the company I was going to. I was also lucky with my timing, as in there weren't long lines of people before or after me. These kind of uncontrollable aspects to the process are part of what makes it so stress inducing.