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At what point should someone move on from a trainer to their next plane, in my case probably a war bird like the P51 Mustang, Hellcat, Corsair or a Spitfire.

Is it a case of being able to proficiently control the trainer, and what about using the Flaps on the next plane when previously on the trainer, there weren't any?

Do I need to have a buddy system setup similar to the trainer for the new plane?


Cheers

Smo0