I just had my first issue with this in a while. I was looking at a potential Japan trip, and SFO-HND on NH was I4 on United. Wouldn't show up on Aeroplan.

Of course, I noticed this at 2102 PST, so there was nothing I could even attempt.

In the end, I don't think the trip makes sense, so it's moot.

But definitely frustrating to see space everywhere except Aeroplan.