The (Cdn) guy who directed me to the extra screening had a sense of humor at least: I asked if the nexus line moved and he replied “yes, and they’ll serve you breakfast in there too”
It took 10 minutes, mostly waiting for my turn for a cursory bag search.
The lounge was open before 5:30 but I couldn’t stay long as it was a long walk to the very end of the commuter jet wing of the terminal.
And my 6am flight? It can’t take off until 6:30 due to noise restrictions.
And yes, I am upgraded on 3 of my 4 flights today.