this is my first post here btw.
English being the common language for aviation at my opinion is simply a global necessity issue. And the fact that it's spoken in United States has to do a lot with it. I mean, let's say we have a Costa Rican, an Indian and a Japenese. The guy from Costa Rica might never go to India or vice versa, same thing with Japan. But probably all 3 of them might at some point in their life go to United States. Just to come up with an example. If the 'center of the world' was somewhere else, or other language than English had been adopted in the US, probably that'll be the one language spoken. It's just the realistic way to see it.
Now, talking about the native language spoken in some countries, it's no other thing than national proud. I mean, is your backyard bud, you'll do what you're used to. And it's completely fine.
Let's go with an example again:
let's say this world was quite a bit different and the 'center of the world' was... France. The world therefore will 'move' in French. Would an American pilot like to call New York Clearance delivery and ask him for a flight plan approval to Miami in French? I bet no. Therefore, a French pilot wouldn't like to call CDG
Clearance and ask the controller if he can go to Nice... in English? definitely no.
In my case, I'd speak Spanish if I was flying in Costa Rica. Though I'm enough open-minded (and hopefully most pilots are) to switch to English if the situation requires so.
The English deal won't change... neither the speaking of the native language in other countries.
Something I want to do if someday become an internatinal pilot is learn the way to make the introduction to the tower in the native language and after that specify to please give further instructions in English. I think that'll be cool.
"Milano suolo buongiorno il American Airlines uno-nove-sete a la cancello cinque presto a... good morning, further instructions in English please" That'll be nice.
We have only one world and we had to find a way to get it together... and due to circustamces, English was the answer. Reminds me of the prayer"grant me the serenity to accept the things I cannot changee, the courage to change the things I can, and the wisdom to know the difference".
Keep in mind that don't matter where you are, where you fly, or what language you speak, remember that a warm smile is the universal language of kindness.
just my two cents worth here.