To those who pop in when I'm afk apologies I am often busy in another room.
The answers to the questions I missed today, yes indeed anyone who agrees with the arena message is welcome to join in / fly there / flight test there. The available planes are everything that can be reasonably fought in. This includes turn fighters, energy fighters and BnZ aircraft, including the WWI aircraft, the Stukas and the RV8. With the later you'll just have to make screenshots really hard.
This morning I was late starting to host because TA57x's arena was up when I checked & I can't host as regularly as I'd like.
