I'm still of the opinion that, in addition to the TA as a fully dedicated training arena, each of the other arenas EW, MW, and both LWs could add one un-captureable "training base" for each chess piece, somewhere back around each HQ.
Those three bases could be coded so that:
1) Any plane that takes off from the training base and stays within the radar circle is immune to enemy fire. In other words, enemy planes that attack training base planes within the radar circle experience "Kill Shooter." So, training planes have to stay within the circle, and there's no incentive for others to bother them. But as soon as training planes leave the radar circle they are fair game.
2) Any plane that takes off from the training base, leaves the radar circle and tries to shoot down an enemy outside the radar circle experiences "Kill Shooter." Same with ordinance. That way no missions can be launched from the training base. It is strictly for basic training.
3) Any noob with say 1 month or less of time in AH who goes to the training base causes it to start flashing to let people know there's a noob looking for help. Put a link on the clipboard for "Training Base." Vets could go to the training base but it would not flash.
In my opinion, even in off hours, someone may be willing to take a few minutes to help the less experienced. It would be much more convenient if that help could be given without having to leave the arena to go to the TA.
True, some people will never read online guides, or attempt to contact trainers, but some do and still need various levels of assistance. In that case I think this idea has merit. Trainers wouldn't have to wait around in an empty TA, but could participate in the game until a noob requests help, and then just click once to get to the training base instead of several to get to the TA.
My 2 cents...