This looks like an advertisement for a children's book about airports. The pages have illustrations or text hidden behind small paper flaps (hinged rectangles) that the child can lift and view under. area=EY&subcat=EYLFB&id=5344
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NL888Does "flap" mean "a movable airfoil that is part of an aircraft wing; used to increase lift or drag"?Yes, but not in this context.