I would reduce the number of groups, and then arrange separate lines for each group (or alternating lines like WN does). 9 separate groups that need to be called one by one is ridiculous, and you will never be able to implement 9 separate lines. Having a single line for groups 1-4 that has group 4 people line up and then wait as group 1 pushes by makes no sense. And I think most FC folks will get over boarding at the same time as EXP.

The other thing AA needs is better signage or continuous announcements for what groups are currently boarding. A lot of people just see a line and join it. And I have seen them start boarding group 1 before calling group 1, and when people see boarding with no announcement they tend to join in.