What is one of the eligibility requirements for obtaining an ATC tower certificate?

To obtain an ATC tower certificate, one of the key eligibility requirements is the ability to read and write English. This is crucial because effective communication is the cornerstone of air traffic control operations. Controllers must clearly understand and convey instructions, clearances, and information to pilots, ensuring safety and efficiency in a high-stakes environment. Proficiency in English helps to mitigate misunderstandings which could lead to serious incidents.

Other options might seem relevant but do not serve as universal eligibility requirements for obtaining an ATC tower certificate. For instance, being at least 21 years old and having prior flying experience may be beneficial but are not stringent prerequisites in every context. Similarly, while having a college degree in aviation could improve a candidate's knowledge or employability, it is not a mandatory requirement for certification. Therefore, the emphasis on English proficiency stands out as a fundamental necessity in the field of air traffic control.