When we talk about learning curves for Aces High, it is mostly Aircraft Management followed by tricks of the trade.
As difficult as we are making it seem, it really can be simplified by using common sense, and patience. Experience will always be the best teacher, but the student must be able to move past their own preconceptions and accept what real life experiences have taught.
For example most enter the game with certain ideas about what a superb weapon the Mustang / 109 / Spitfire was in their time frame. But it doesn't take long to figure out that E state, acceleration, climb rate, turn rate, and the master of them all, stall speed, will re write everything you thought you knew about flying either of the fore mentioned birds against an experienced pilot.
HTC already has a ton of training documents accessible through the website and online help, but this only gets you through the initial setup phase and onto the where do I point my weapon phase (viable targets / how much damage / what damage does). However, it does very little to show HOW TO inflict damage.
HOW TO phase is the learning curve described in Fish's hilarious chart. Here you have to get in the cockpit and quickly learn to develop SA situation awareness (where am I / where are my friends / where are the bad guys). Just as important also is who are the bad guys / what are they doing and what is my plan.
My only suggestions for grasping the HOW TO, is to join a squad, especially one that has live round practice, or FSO (or other scenario promising air combat and target seeking opportunities). Get a hold of one the online trainers and spend some time and record the lessons they provide, then practice what you have learned until polished............... THEN U R A DWEEB... errrr WEAPON!

It's far greater than that, at least one mile.
Don't ever doubt Snailman. Remember the map with the 10k field with steep slope? I remember folks letting troops go at the bottom of the slope and them riding the escalator to the top on their way to the maproom.
