Dozens of flights cancelled at San Francisco airport

However, a United Airlines/Air Canada/Lufthansa service to Newark Airport - 35 miles away from JFK - took off as normal at 9am. A plane landing at Chicago's O'Hare International Airport slid off the runway amid slippery conditions Friday afternoon.

At least 27 flights to and from Palm Beach International and more than twice as many to and from Fort Lauderdale-Hollywood International Airport have been preemptively canceled. They'll cancel operations in Washington, D.C., and Baltimore on Saturday.

Carriers such as American Airlines, Southwest and JetBlue have grounded flights planned for Charlotte, N.C., Washington D.C., Boston, Baltimore and Philadelphia.

The good news, he said, is that when the weather is this severe, airlines typically waive charges for rebooking and rescheduling. As of 10 a.m., there were already 489 delayed flights in the USA today, according to FlightAware.

Underscoring the headache for fliers, airlines preemptively canceled more than 3,000 flights before the first snowflakes had even fallen in the region. "Blizzard Warning issued. Up to 8" by Friday night, up to 12" by Saturday evening.

United Airlines: If you're traveling into or out of any of the 35 airports on United's list between January 22-24, you can change your flight for free. Travelers should check with their airlines for the status of their flights. Snow arrives to parts of Northern Kentucky after morning drive. Last year, the NY area was expected to be clobbered by a massive blizzard that missed the city, unleashing its fury upon Boston instead.

Amtrak's Keystone Service between Harrisburg and NY will have a modified schedule with fewer trains.

The Southeastern Pennsylvania Transportation Authority - which operates subways, buses and commuter rails in five counties, including Philadelphia - will suspend most operations starting early Saturday.

Cavaliers fire coach David Blatt in second season
In 123 games as Cavaliers head coach, Blatt led Cleveland to a 83-20 record and guided the team to the NBA Finals last season. The pair shook hands and smiled at each other, without any hint that a coaching change could be forthcoming.