It’s fine to ask, I should have explained clearer, but for your scenario it’s fine if you leave it like that as PlaneClient and CarClient.
…But what if you want to combine CarClient and PlaneClient because well it sounds cool right definitely a cool gameplay element should be easy with OOP right?
nope
I learned it from this article I found in this post after researching how to structure an OOP game. It’s a very famous problem since 1991 if we were to cite Wikipedia 
Even on wikipedia it lists no solutions to the problem only mitigations so yeah I wanted to avoid this problem entirely in order to make my code clean to edit in the future so yeah I was thinking of splitting it up into components…yep ECS should provide more flexibility in this area I’ll see how this goes tho.