LaGuardia Airport was dedicated in 1939 as New York Municipal Airport.  Adjacent to it was the Marine Air Terminal which serviced the Pan Am flying boats.

From Wikipedia: “The Marine Air Terminal (MAT) was the airport's original terminal for overseas flights. The waterside terminal was designed to serve the fleet of flying boats, or Clippers, of Pan American Airways, America's main international airline throughout the 1930s and 1940s. When a Clipper would land in Long Island Sound, it would taxi up to a dock where passengers would disembark into the terminal. During World War II new four-engine land planes were developed, and flying boats didn't carry scheduled passengers out of New York after 1947. The last Pan American flight left the terminal in February 1952, bound for Bermuda.”

The water tower on the horizon has lettering on it that says, “Consolidated Edison”.  That’s New-York-City-speak for the electric company.

The Marine Air Terminal.  I have no idea why that DC-3 is being hoisted out of the water.

Four engined land planes also known as Lockheed Constellations.  These and others replaced the flying boats.