From the Daily News:
City officials had long sought to construct their municipal field on Governors Island, but this was an idea that never worked out, and finally Mayor Fiorello LaGuardia bought North Beach Airport, which was a small private operation situated on a dismal strip of Flushing Bay badlands, and ordered it quintupled in size.
Mostly built on millions of cubic yards of landfill dumped into the bay by federal relief workers, the new North Beach was a nightmare from the beginning, as the runways kept sinking and buckling, and it fast turned into a colossal boondoggle as its original $13 million price tag more than tripled.
But the field was LaGuardia’s personal pride and joy, and when it started running in December 1939, freshly rechristened after himself, he was pleased to boast that it was the nation’s biggest and best-equipped. Which it was, but LaGuardia Field was also, from Day One, already obsolete.