Transit systems struggling to restart

Have you been affected by Hurricane Sandy? If so, share your images and footage with CNN iReport, but please stay safe.

Story highlights

NEW: Amtrak has no estimate for when trains to and from Penn Station will be back up

Some New York City area airports set to offer limited service Wednesday

The New York City transit system sustains devastating damage

More than 19,500 flights have been canceled, a flight tracking site says

New York CNN  — 

Superstorm Sandy has weakened, yet her presence will be felt in the days and weeks to come as transportation systems assess impacts and try to resume schedules.

Walloped by severe storm damage and flooding, the New York City area’s extensive transportation system is struggling to get back online, while some area airports are resuming service on Wednesday. Other Northeast and mid-Atlantic airport and ground transportation systems were gradually resuming operations.

Here’s what’s happening in many of the affected areas:

Sandy’s impact: State by state

Airline operations resuming