Originally Posted by canadiancow

One time flying LH MUC-SFO, I had to go through a huge hassle because the address I had listed when I checked in was the in US, and I had a Canadian passport.

Had I said I lived in Canada, it would have been a lot less pain, but living in the US, they had to go enter all kinds of visa information, etc.

So if there was a connection on the ticket to somewhere other than Canada, this makes a lot of sense.