It would be neat if there was a quick runthrough with things such as Take-off, Raising/Lowering Gear, Use of Control Surface (ailerons, elevators, rudders, flaps), throttle & manifold pressure control, autopilot and autoclimb, and maybe basic gunnery against a drone, and then landing.
Possibly do an "Advanced" training walkthrough as well that starts with an airspawn and a steep dive angle to teach people things like trim up, flat spin recovery, carrier landing (putting your hook down), rearming, and more advanced gunnery with lead shots.
Have a Basic and Advanced Bombing walkthrough showing people how to use their bomb site in the auto and manual settings. Level and Dive bombing, setting your salvo and delay times, and rear gunnery.
Then a vehicle walkthrough that I think could be basic/advanced in one because I honestly don't find vehicles that crazy. ASDW, Left Click, Right click and 1,2,3,4... that's just about it.
But I think these things could be automated using the existing offline/co-op mission system, make it voluntary, but also add Achievements for completing them because both new and old will probably be more likely to do it if it helps them get a star. And it will avoid having to rely upon random players to teach.
At the end, maybe have a link to the AH Training Forum to ask for additional help if needed.