[pyreko]

Obviously anecdotal but I've had zero issues with preclearance at Pearson as a TN holder, both crossing and when applying for TN. They usually just ask me some combination of where I work for, what I do, and if I know when my TN expires, and that's it. My experience applying there has also been incredibly uneventful. I guess engineering is a bit easier to do though, especially if you have a strong application that's been done by lawyers.

I've been given hell by immigration about my TN when flying directly into US airports though.

[hervature]

Conversely, preclearance at Pearson royally screwed up my TN visa after claiming that the other ports of entries were doing it wrong. I have received multiple TN from HOU and, in general, I like the CBP at HOU. EWR was always friendly as well in my opinion. I personally prefer getting my TN at land border crossings because they tend to take the "gather all the facts" approach vs. airports have a procedural approach that feels highly dependent on the agent you get. My most recent TN was I-129 which I think is a waste of money but if someone else is paying for it and you have the luxury of waiting in the US, then it's a seamless experience.