  We find a family of 3d steady gradient Ricci solitons that are flying wings.
This verifies a conjecture by Hamilton. For a 3d flying wing, we show that the
scalar curvature does not vanish at infinity. The 3d flying wings are
collapsed.
  For dimension $n\ge 4$, we find a family of $\mathbb{Z}_2\times
O(n-1)$-symmetric but non-rotationally symmetric n-dimensional steady gradient
solitons with positive curvature operator. We show that these solitons are
non-collapsed.
