The support of a dual Schubert polynomial equals the Minkowski sum of inversion intervals, and its Newton polytope vertices come from coefficient-1 monomials of a product of linear forms.
Double Schubert polynomials do have saturated Newton polytopes
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Newton polytopes of dual Schubert polynomials
The support of a dual Schubert polynomial equals the Minkowski sum of inversion intervals, and its Newton polytope vertices come from coefficient-1 monomials of a product of linear forms.