FACTBOX-Some US Northeast transport services return after Sandy

NEW YORK, Oct 31 (Reuters) - As the U.S. Northeast recovers from Hurricane Sandy, the following is a list of transportation service updates for New York, New Jersey and the District of Columbia:

*The Port Authority of New York and New Jersey said JFK and Newark airports reopened on Wednesday with limited service so passengers advised to check with airline before going to the airport. LaGuardia remained closed with no estimated opening time from the Port Authority in an NY1 TV interview.

* Washington and Baltimore airports expect to see more arrivals and departures on Wednesday after some area airports began resuming limited flights on Tuesday, the Metropolitan Washington Airports Authority said. Many flights will remain canceled so passengers should check with airlines. Officials continue to monitor for possible Potomac River flooding that could at Reagan National, the agency said.

*There have been more than 19,500 flight cancellations so far since Sunday, include 2,801 canceled so far for Wednesday, more than 14,800 were on Monday and Tuesday, and 481 cancellations set for Thursday, flight tracking service FlightAware.com said.

*American Airlines aims to resume operations this afternoon in most cities but will likely not re-start in the New York area airports until Thursday.

*Delta Air Lines plans to resume limited flights at Newark Liberty and JFK airports on Wednesday. Expects flying at LaGuardia to re-start Thursday.

Southwest Airlines expects normal operations in most of the U.S. Northeast and Mid-Atlantic by mid-morning Wednesday, with the exceptions of LaGuardia and Newark Liberty Intl Airport, where Wednesday flights are not expected.

*New York subway remains shut as are commuter railroads MetroNorth and Long Island Railroad. The Metropolitan Transportation Authority said had no update as to when services might resume as the railways had suffered significant damage.

*New York City buses were running on Wednesday but on a reduced schedule, according to the MTA. It also warned that some buses are being rerouted as drivers are avoiding streets with obstacles such as fallen trees.

* New Jersey PATH trains remained closed and a Port Authority spokesman did not provide NY1 with an estimated opening time. New Jersey Governor Chris Christie said on Tuesday that the PATH is likely to be suspended for at least a week to 10 days.

* NJ Transit rail, light rail & Access Link services remained suspended Wednesday. Starting Oct. 31. NJT bus service was set to operate in Camden County only.

*Port Authority Bus Terminal in Manhattan open for business but passengers should check with their bus company to see if they are running services, Port Authority told NY1.

*Amtrak: Has restored services from Virginia as far as Newark but services north of Newark are still suspended as are Acela services in the hurricane region. Amtrak said it may be evening before its next service update. Customers are advised to check Amtrak.com for updates.

*Greyhound bus service in and out of New York City will remain suspended on Wednesday though upstate services have resumed. It hopes to resume New York services on Thursday and plans to update later in the day. It began limited service in and out of Baltimore, Richmond and DC Tuesday. Buses from Boston to Bangor and Montreal resumed but southbound buses from Boston were still suspended Wednesday morning.

* Federal government offices in the Washington, D.C., area and the District of Columbia's local government reopened on Wednesday.

* Metro rail and bus service in and around Washington, D.C., returned to normal service on Wednesday after reopening on a modified schedule Tuesday afternoon, according to the Washington Metropolitan Area Transit Authority.

* MARC commuter train service which connects Washington, D.C., with cities in Maryland and West Virginia, resumed on Wednesday with just a few minor delays.

* Maryland state government facilities reopened on Wednesday along with early voting polling locations. Maryland canceled early voting service on Monday and Tuesday for the Nov. 6 U.S. presidential election. The state will make up lost early voting time with extended hours and another day on Friday.

(Reporting by Sinead Carew in New York, Susan Heavey in Washington and Karen Jacobs in Atlanta; Editing by James Dalgleish)