V-Flyer

Myself & eight members of my family, two of them who will also be AU the same time as me, are going to MCO April 17. We will be booking in a few weeks time. At the moment I am a AG member and will be AU in September 16
Will I be able to select our seats for the April trip when I become Gold in September for free. Also will the remaining members of my party be able to check in at UC at the airport.

Yes and yes.

An Au can only guest one person into the Clubhouse though, so if three of you are Au six of you can get in.