Well I am ticketed on the A380 with seats assigned F both ways. The website says that the Booking Code is A. I had a second reservation on hold that was cancelled so good thing I got one in.
Of note, a few years ago I purchased a ticket in C on AC to south america through expedia. A lot of FT'ers purchased this mistake. In the end, I got my money back and the EQMs on United I would have received anyways, but only after a lot of angry phone calls and being accused of stealing from AC by a phone agent.