Cynical old son, take a deep breath and a chill pill
There is right and there is wrong. Aeroplane is right, airplane is not. Just as gaol is correct and jail isn't.
You have sweetly proved my argument. Check your Macquarie Dictionary - either spelling
gaol/jail is acceptable. The language is constantly evolving, but self-righteous pedants, like flat earthers, are not.
Don't dig the hole any deeper, let people call the damn thing whatever they are comfortable with.