Harbor Patrol airplane

The video discusses the vastness of New York City and the role of New York cops in patrolling the airspace in 1939. It highlights the importance of the Telegraph Bureau in the NYPD, which uses telephone, teletype, and radio to maintain constant communication with all police units, including station houses, boats, and planes.

What does the New York cop patrol above the city?

What are the means of communication mentioned in the text?