What is the correct way to state a distance of 30 miles?

The correct way to state a distance of 30 miles in air traffic communication is "three zero miles." This format is used to ensure clarity and avoid any misunderstanding, especially in aviation, where precise communication is critical. The use of "three zero" clearly conveys the number 30, emphasizing each digit due to potential radio transmission issues or audio interference that might occur.

Alternatives like "thirty miles" or "thirty point zero miles" may not provide the same level of clarity, especially under busy or noisy conditions. Saying "three miles" would inaccurately communicate a completely different distance, making it essential to represent numbers distinctly for safety and accuracy in air traffic situations.