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(CNN) -- Severe weather and turbulence are disrupting Thanksgiving travel on Wednesday, particularly at busy airports in the northeastern United States.
According to tracking site FlightAware, more than 1,000 flights have been delayed, though fewer than 50 have been canceled.
Low visibility caused the Federal Aviation Administration (FAA) to slow flights to New York's LaGuardia and Kennedy airports while changing runways for inbound and outbound flights.
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Flights from Newark and LaGuardia were delayed due to the large number of planes flying and weather issues.
The FAA said the weather could cause further disruption at airports in New York, Boston and Philadelphia.
The agency also reported "severe turbulence along the East Coast" that is disrupting its routes to Florida. This is causing North-South congestion in this high-volume region, and the FAA warned airlines to be aware of disruptions when refueling planes. The FAA had opened airspace in this area normally reserved for military flights in anticipation of the high volume of Thanksgiving flights.
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At Washington's Reagan National Airport, the Transportation Security Administration expects to reach capacity on Wednesday. Wait time in regular screening lanes reached 25 minutes, approaching the agency's goal of having passengers wait no more than 30 minutes.
The FAA expects to conduct more than 49,600 flights on Wednesday and the TSA expects to screen more than 2.7 million passengers.
Bad weatherAir travel