There's been some good advice offered here. If your son is passionate about flying then hopefully that'll provide some motivation to do well at school. Trust me, he'll need to.
Ok - he's 10 yo. Make sure he looks after his health. Simple things like wearing a helmet when riding his bike or skateboard and so on. Protect his hearing and eyesight. Lose those, game over.
I know one kid back in Oz that fell off his skateboard whacking his head quite hard and losing a % of hearing. That simple accident closed aviation to him. (And quite a few other occupations).
Is your son colour blind? How's his vision?
Start saving now.
Encourage him to "own" his future. if he wants money, he needs to do chores etc. When he can, a part time or summer job will be invaluable for his confidence and maturity.