National Heritage Area Extension Act of 2004 - Amends the Omnibus Parks and Public Lands Management Act of 1996 to extend to September 30, 2027, the authorization for making grants or providing assistance with respect to the National Coal Heritage Area, Tennessee Civil War Heritage Area, Steel Industry Heritage Project (the Steel Industry American Heritage Area), Essex National Heritage Area, Ohio & Erie Canal National Heritage Corridor (redesignated by this Act as the Ohio & Erie National Heritage Canalway), and Hudson River Valley National Heritage Area.
National Aviation Heritage Area Act - Establishes within the States of Ohio and Indiana the National Aviation Heritage Area.
Amends the Omnibus Parks and Public Lands Management Act of 1996, to: (1) make additions to the National Coal Heritage Area; (2) provide specified assistance to the National Coal Heritage Area Authority; (3) make resources within Lincoln County and Paint Creek and Cabin Creek also eligible for assistance; (4) provide for the Authority to submit a Coal Heritage Management Plan for the Area; and (5) require the Plan to set forth responsibilities of the Authority.
Reauthorizes appropriations for the New Jersey Coastal Heritage Trail Route.
Illinois and Michigan Canal National Heritage Corridor Act Amendments of 2004 - Provides for the designation, upon the termination of the Illinois and Michigan Canal National Heritage Corridor Commission, of the Canal Corridor Association to be the management entity for the Corridor.
Oil Region National Heritage Area Act - Establishes the Oil Region National Heritage Area in Pennsylvania.
Crossroads of the American Revolution National Heritage Area Act of 2004 - Establishes the Crossroads of the American Revolution National Heritage Area in New Jersey.
Western Reserve Heritage Areas Study Act - Provides for a study regarding the establishment of the Western Reserve Heritage Area in specified Ohio counties.
Provides for updating the John H. Chafee Blackstone River Valley National Heritage Corridor plan.