NEW YORK (CBSNewYork) — LaGuardia is once again the worst in the nation for flight delays in the country so far this year, according to the FAA.

An analysis from the Bureau of Transportation Statistics on the nation’s top 29 airports for passenger traffic shows that LaGuardia had the lowest on-time performance, followed closely by Newark and JFK airports.

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“Despite years of spending on terminals and runway improvements, our New York-New Jersey airports still lead the nation in flight delays, leaving passengers stranded on the runway or in the crowded airways circling our hubs,” said Global Gateway Alliance Chairman Joe Sitt. “The bottom line is more dramatic steps are needed to relieve the problem. It is past time for the FAA to fully implement NextGen in our airspace, where it’s most needed, and we must expand the runways at our airports.”

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The leading cause of delays at all three airports by a wide margin is the National Aviation System, or the airspace, affecting approximately one in 10 flights, the FAA found.

GGA also pointed out that New York area airports are space constrained and need new runways to accommodate growing passenger volumes.

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The report also found that July was the worst month for delays so far this year at New York area airports. March was the best for performance.