[Nockers]

On the gray over white birds the upper flap color is white if thats what you are talking about.

see for yourself

http://www.airliners.net/search/photo.search?&aircraftsearch=Grumman%20A-6E%20Intruder%20%28G-128%29&nr_of_rows=172&first_this_page=0&page_limit=15&sort_order=photo_id+DESC&nr_pages=12