Of the 10 most chronically delayed flights in the U.S. over the past two years, all are ExpressJet Airlines flights for United that either take off from or land in Newark.

WSJ: The Worst Flight in America

ExpressJet and American Airlines had the worst records with only 76.9 percent of their planes arriving on time last year.

NPR: Airline Passenger Complaints Surged In 2012

ExpressJet and American Airlines had the worst on-time performance (76.9%) last year, according to the data gathered in the 23rd annual report.

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ExpressJet, a unit of SkyWest Airlines, said it has so many flights on the chronically delayed list simply because it is flying in and out of Newark so much in the most congested airspace in the country.

WSJ: The Worst Flight in America

Houston-based ExpressJet, he thinks, made a mistake in spurning takeover inquiries from SkyWest, especially now that Continental Airlines has declined to renew its flying agreements for the bulk of ExpressJet's 50-seat jets.

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Five other airlines -- Atlantic Southeast, Comair, ExpressJet, Mesa and Pinnacle -- didn't get an overall grade because some categories couldn't be completed.

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The ExpressJet plane was towed back to the gate, and the Scandinavian Airlines plane taxied back to the gate, where passengers disembarked, New York's WNBC-TV reported.

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Scandinavian Airlines Flight 908, bound for Oslo, Norway, was directly behind ExpressJet Flight 4226, destined for Nashville, Tenn.

WSJ: 2 airplanes about to take off clip at NJ airport

The airlines covered in the report are Air Tran, Alaska, American, American Eagle, Delta, ExpressJet, Frontier, Hawaiian, JetBlue, SkyWest, Southwest, United, US Airways and Virgin America.

NPR: Airline Passenger Complaints Surged In 2012