Two air traffic controllers and a supervisor at John F. Kennedy Airport of New York City have been "placed on administrative leave" after two children were allowed to give radio instructions to several pilots last month.

New York local TV NY1 reported Wednesday that the Federal Aviation Administration (FAA), an agency of the U.S. Department of Transportation with authority to regulate and oversee all aspects of civil aviation in the country, has suspended all unofficial visits to the FAA air traffic facilities as it reviews policies.

The first set of exchanges between a child and pilots waiting to take off from JFK reportedly took place on Feb. 16. They were recorded and posted on the website.

On the recordings, the child appears to be repeating simple instructions given by his father, says NY1.

Then, on Feb. 17, another child was allowed to speak to two departing pilots, FAA officials said.

"This lapse in judgment not only violated FAA' s own policies, but common sense standards for professional conduct. These kinds of distractions are totally unacceptable," FAA Administrator Randy Babbitt said.

"We have an incredible team of professionals who safely control our nation' s skies every single day. This kind of behavior does not reflect the true caliber of our workforce," he added.

At the time of the two incidents, a majority of schools were on winter break.

JFK airport is the busiest international air passenger in the United States and is also the leading freight gateway to the country by value of shipments. Over 90 airlines operate out of JFK.