Originally Posted by
C-FMWQ
Also, I might have just been too tired to notice but I ended up leaving customs and having to reclear CATSA security to get to my domestic gate (User error since I wasn't able to read the signs

?). Wasn't an issue since YUL was pretty dead but I thought the whole idea of OSS allowed for connections without reclearing security?
I guess you were too tired to notice. When you go down the stairs in to the main customs hall you need to keep left and left again by where the elevators are to get to the OSS domestic connections area, which bypasses having to clear security. Usually there is someone hollering about "domestic connections this way" but if it was pretty dead then maybe not.