More than one year ago, the Federal Aviation Administration relocated more than a dozen New York-based air traffic controllers to Philadelphia, where they continue to handle flights into and out of Newark Liberty International Airport.

The FAA said Monday it is now asking the New Jersey air traffic controllers to stay in Philadelphia for two more years as it tries to improve staffing levels.

Last year, a CBS News New York investigation revealed the move caused 817 flight delays at Newark within the first two weeks.

The 14 controllers previously handled Newark air traffic from a facility on Long Island, where the FAA has struggled to train and retain staff . So far, 11 have agreed to remain in Philadelphia for another two years, the agency said.

While FAA leaders say they a

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