On board the plane. It’s a CRJ 200… It’s a mini jet …. It seats 50 passengers or so. Boarding was weird. There were four rather large CBP agents standing in the jetway. I’ve flown internationally a few times and have never noticed that. Perhaps they have always been there and I’m more aware because this is a small plane that uses a smaller jetway than usual, but their presence was striking. Or perhaps I continue to underestimate the acuity of the Canadian threat….