If your experience at Newark Liberty International Airport has ever been less-than-stellar, it's not just you. And data from thousands of flyers back that up.

The JD Power 2018 North America Airport Satisfaction Study puts Newark Airport in last place among "mega airports," with a score of 701 points out of 1,000.

In fact, the three major airports operated by the Port Authority of New York and New Jersey rank at or near the bottom of an annual customer satisfaction survey.

New York's LaGuardia Airport came in last among "large airports," with 678 points out of 1,000.

John F. Kennedy International Airport did better than Newark among mega airports, but still ranked below average with a score of 752.

The study, which began in September 2017 and concluded this month, looked at six factors: terminal facilities, airport accessibility, security, baggage claim, check-in, and food, beverage and retail.

More than 40,000 travelers participated in the survey.

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In Newark and JFK's category, Las Vegas McCarran International and Florida's Orlando International ranked first, followed by Detroit Metropolitan Wayne County and Denver International.

In LaGuardia's category, John Wayne in Orange County, California, ranked first, followed by Dallas Love Field and Portland International.

Los Angeles International and Chicago O'Hare fared slightly better than Newark, but still ranked near the bottom. Miami International and Boston Logan fared slightly worse than JFK.

LaGuardia ranked notably worse than the next two large airports near the bottom, Kansas City International and Philadelphia International.

In a statement, the Port Authority said it's committing $28 billion to modernizing the airports "into 21st century gateways to the region," including a complete overhaul of LaGuardia and the new Terminal One at Newark.

The projects also include upgraded runways and taxiways and improved roadways.

"Additionally, we have launched partnerships with various airport stakeholders to introduce new technologies and concessions, facility enhancements including restroom upgrades, new retail opportunities and other amenities," the Port Authority said.

Beyond the scope of JD Power's survey, the Port Authority's three big airports are among the country's worst for delays, according to the federal Bureau of Transportation Statistics.

In the five months ending May 31, LaGuardia and Newark ranked 29th and 30th for on-time arrivals, at 72 percent and 68 percent, respectively. JFK ranked 26th at 76 percent.

As for departures, only Boston Logan and Chicago Midway ranked lower than LaGuardia and Newark, where 75 percent of flights took off on time this year as of May 31. At JFK, 78 percent of flights took off on time.

See the complete ranking for North American mega-airports below.

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