Air traffic control staffing issues are delaying travel at airports in New York , Washington, Newark and Houston, the Federal Aviation Administration said late on Thursday, as a U.S. government shutdown hit its 23rd day.

The FAA was reporting staffing issues at 10 different locations and issued ground stops at Houston Bush and Newark airports. Flights at Ronald Reagan Washington National Airport were being delayed an average of 31 minutes and delays at New York LaGuardia were averaging 62 minutes.

Unpaid workers fuels operational strain

Some 13,000 air traffic controllers and about 50,000 Transportation Security Administration officers must work without pay during the government shutdown.

FlightAware, a flight tracking site, said more than 4,200 U.S. flights had been delayed Thur

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