Originally Posted by
Bartolo
Not having to repeat security for transborder would be fantastic but don't think it will happen. Works the same in Europe and Australia -- clear customs and redo security if connecting.
At YVR transborder, you clear security then proceed to US CBP.
In theory you could dump 'secure' people into the US customs-hall from elsewhere.
I think the primary concern is that security for US flights is a little different (shoes off etc.) so you'd have to bring "flying to the USA rules" to all of Canada if you wanted to do this.