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The text and very narrow lines used in the drawings for "Krueger flap operation" and "Slat operation" are too narrow to display properly, the drawings look faint and washed out. —Preceding unsigned comment added by Dougher (talk • contribs) 05:12, 28 August 2010
The article isn't claiming that the Krueger flaps on the 747 were the first, or pre-dated those on the 720 or 727. The article is citing page 114 from John W.R. Taylor's book Lore of Flight. It may be that Taylor's book talks only about Krueger flaps on the 747 and omits any reference to such flaps on earlier aircraft types. I don't have immediate access to a copy of Taylor's Lore of Flight so I can't comment further.
If the article is to have a statement about Krueger flaps on the 720 it needs to cite a reliable published source for that statement. Dolphin(t)03:28, 25 April 2011 (UTC)[reply]