I ran across some issues picking seats in advance on some carriers and couldn't find a central reference, so I thought I'd create a thread we can use to document and reference the various rules. I'll start the wiki above!

I threw the ones I know off the top of my head (well, sorta) in the wiki. Ones I'm personally interested in are:

-Air China
-Asiana
-Lufthansa

I have unassigned seats in premium cabins on those flights and would like to know if I can choose them in advance, so if anyone knows, please fill out the wiki above and bump the thread! (Also, any hints such as "must call, cannot access online" would be helpful.)