Originally Posted by
ACA321
I've never had an issue checking in for an AC flight that occurs after a first leg on a partner airline (LH and NH in my case). Just go to the AC website and check in for the FRA-YYZ portion, where you can eUpgrade then. This way, you can check in for that LH portion 23 hours before the flight (why LH does 23 hours vs. 24 doesn't make sense to me, but is what it is). I've done this several times with success.
Same experience here.
Academic's language was somewhat misleading. It's not for flights *ticketed* by AC but for flights *operated* by AC that one can check in online. Even if it's a connection with a previous non-AC flight.