Please check American Airlines' Travel Notices page here, as these issues can be quite dynamic.
Northeast Travel Policy 2 (Updated 1100 AM Central 27 Dec 2010)
Due to winter weather in the Northeast, American Airlines offers customers the convenience to change their plans. Customers ticketed to travel on American Airlines flights to or from the areas listed may change flights as shown without penalty.
No changes - still current as of 11 AM Central 28 Dec:
If you are traveling to/from/through:
Boston,MA (BOS)
Hartford, CT (BDL)
New York, NY(JFK/LGA/EWR)
Philadelphia, PA (PHL)
Washington,DC (BWI/IAD/DCA)
On the following date: Dec 27, 28 2010
And your ticket was issued no later than: Dec 26, 2010
You may begin travel as late as: Dec 27 2010 - Jan 01, 2011
Original inventory required? NO
One ticketed change is allowed with no penalty.
Superseded Northeast Travel Policy 1:
If you are traveling to/from/through:
Boston,MA (BOS)
Fayetteville, NC (FAY)
Greensboro, NC (GSO)
Hartford, CT (BDL)
New York, NY(JFK/LGA/EWR)
Norfolk, VA (ORF)
Philadelphia, PA (PHL)
Richmond, VA (RIC)
Raleigh Durham, NC (RDU)
Washington, DC (BWI/IAD/DCA)
White Plains, NY (HPN)
On the following date: Dec 26, 27, 2010
And your ticket was issued no later than: Dec 23, 2010
You may begin travel as late as: Dec 25 - 29, 2010
Original inventory required? Yes
One ticketed change is allowed with no penalty.
==============MODERATOR NOTE=============
This post has been updated as of 1100 / 1100 AM Central Dec 28, 2010. Please check the link above for changes and current conditions.