Can Non-Native English Speaking Pilots Use Other Languages With Air Traffic Control?

It’s obvious a universal aviation language is needed for pilots and air traffic controllers to communicate clearly and efficiently around the world. While there have historically been attempts to establish constructed international auxiliary languages (most notably Esperanto), English was ultimately chosen for a range of economic and political reasons. Miscommunication and language barriers have led to catastrophic (but preventable) accidents, and now, the aviation language is clearly spelled out in English.