Fog at U.S. airline hubs in New York and Philadelphia slowed travel as the Christmas holiday approached, with about 1,500 flight delays and 260 cancellations spread across the country.

Philadelphia International Airport had about 90 inbound and outbound trips scrubbed to lead the U.S., industry data tracker FlightAware reported. That airport also posted the most tardy arrivals and departures, followed by New York’s LaGuardia, according to FlightAware.

Today’s disruptions came ahead of Christmas Eve, one of the lightest days of the 19-day holiday travel period tracked by the Washington-based Airlines for America trade group. A4A, as the organization is known, predicts 45 million people will fly in the U.S. during that season.

Some Philadelphia arrivals were almost two hours late, the Federal Aviation Administration said on its website. Planes bound for LaGuardia and New Jersey’s Newark Liberty also were running behind, the FAA website showed. Philadelphia’s biggest tenant is American Airlines’ US Airways unit, while Delta Air Lines is No. 1 at LaGuardia and United Airlines at Newark.

Fog shrouded both LaGuardia and Newark, according to weather data compiled by FlightAware, while clouds were higher and better visibility prevailed at New York’s Kennedy airport, the third major facility in the busiest U.S. travel market.

Mild weather gave fliers a break from the frigid conditions typically associated with late-December travel in the northern U.S. LaGuardia was at 44 degrees Fahrenheit (7 degrees Celsius) at about 11 a.m., and the National Weather Service forecast that tomorrow’s high will top out near 57 degrees in New York’s Central Park.

–With assistance from Brian K. Sullivan in Boston.

To contact the reporter on this story: Ed Dufner in Dallas at To contact the editors responsible for this story: Ed Dufner at 

Photo Credit: FlightAware's Misery Map of the U.S. FlightAware