Friday air travelers faced headaches in the Northeast as a storm brought heavy rain, wind, poor visibility and even some snow to the region.

Nationwide, about 220 flights had been canceled and another 970 delayed as of 11 a.m. ET, according to flight-tracking service FlightAware. Looking ahead to Saturday, most big U.S. airlines had issued weather waivers for airports that could be affected as the weather takes a wintry turn. (Scroll down for a full list)

For Friday, the worst of the problems were at the airports serving the New York City area. Those airports already are among the USA’s most delay prone, experiencing flight back-ups even in moderate weather events.

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Delays of up to three hours were affecting flights at New York’s JFK airport, the Federal Aviation Administration’s flight-delay map showed at 11 a.m. ET. Delays of two hours or more were also being reported at New York LaGuardia and Newark Liberty airports, according to the FAA.

FlightAware’s data showed nearly 15% of the entire day’s schedule at LaGuardia was running behind schedule while about 6% of Friday’s flights had been canceled altogether. The percentages were running lower at JFK and Newark, but were high enough to be a nuisance for many fliers ticketed to travel through those airports Friday.

Fliers should also expect sporadic delays elsewhere in the region Friday as the system moved through. Philadelphia, Boston and Washington’s Reagan National were among other busy airports where weather-related disruptions were possible. Lines of strong thunderstorms also could affect airports in eastern Virginia and North Carolina, especially early in the day.

The disruptions in the Northeast and mid-Atlantic could…