Airlines have canceled almost 9,000 flights, starting Sun., Oct. 28, as Hurricane Sandy makes its way toward the U.S. East Coast.

The storm is expected to make landfall early Tuesday morning, with severe winds and a surge of up to 11 feet in coastal waters, the National Weather Service says.

The Port Authority of New York and New Jersey says New York John F. Kennedy International and LaGuardia airports, and Newark Liberty International Airport remain open, although all airlines have suspended flights at the facilities today. No update on when flights will resume was given.

Runway flooding at LaGuardia, in particular, is of concern, says a source familiar with the airport but not authorized to speak on the record.

The Metropolitan Washington Airports Authority reports that Washington Dulles International Airport and Ronald Reagan Washington National Airport remain open, but flights at the facilities ceased early this morning.

The Massachusetts Port Authority, which oversees Boston Logan International Airport, says the facility remains open, although most flights have been canceled. Philadelphia International Airport reports limited service may resume tomorrow afternoon.

So far, 1,300 flights were canceled on Sunday, Oct. 28, and close to 7,000 have been canceled so far today. Airlines have announced a further 2,500 cancellations for tomorrow.

It remains unclear when service will resume along the East Coast, although United Airlines says it plans “limited” operations at the New York and Washington airports on Tuesday. US Airways suspended East Coast operations for Tuesday, and inbound international flights will either hold in Europe or divert to Charlotte,N.C., a spokesman tells Aviation Week.

No airline has yet put a dollar figure on potential losses caused by the hurricane. Raymond James analysts say this one-time event may not affect fourth-quarter earnings, although the impact may be reported in the first-quarter 2013 results. However, passenger revenue per available seat mile in the fourth quarter may appear inflated, the analysts note, as capacity will be lower than expected, while passenger traffic will remain the same.