Reply to a playground challenge

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Possible Answers: CANSO.

Last seen on: Wall Street Journal Crossword – Aug 25 2018 – Topic Secret

Random information on the term “CANSO”:

An air navigation service provider (ANSP) is a public or a private legal entity providing Air Navigation Services.[1] It manages air traffic on behalf of a company, region or country. Depending on the specific mandate an ANSP provides one or more of the following services to airspace users

These services are provided to air traffic during all phases of operations (approach, aerodrome and en-route).

Air navigation service providers are either government departments, state-owned companies, or privatised organisations. The majority of the world’s Air Navigation Service Providers are members of the Civil Air Navigation Services Organisation located at Amsterdam Airport Schiphol.

CANSO on Wikipedia