What is the correct format for the frequency 126.55?

The correct format for expressing the frequency 126.55 in aviation communication is "one two six point five five." This choice aligns with the standardized communication protocols used by air traffic controllers and pilots, which emphasize clarity and precision. Each digit is pronounced individually to avoid misunderstandings, especially over radio transmissions where clarity can be impacted by interference or poor reception.

The use of "point" is essential as it designates the decimal part of the frequency, ensuring that listeners understand it is not a whole number or a different kind of numerical representation. This method reduces the risk of confusion that can arise from misinterpreting numerals, which is critical for maintaining safety and efficiency in air traffic communications.

Other options do not adhere to standard phrasing in aviation. For example, using "one hundred twenty-six point five five" might be longer and more complex than necessary for ATC communication, while "one two six point five" is incorrect because it omits the final digit, which is crucial for accurately communicating the frequency. Lastly, "thirty-two point five" is entirely unrelated to the given frequency and demonstrates a misunderstanding of frequency values.