Album cover oriented normally:
Twin Towers are aligned with the “U” and “P” in “SUPERTRAMP”. When the image is mirrored, the letters read as “9 11”. Breakfast service and low sun imply this is a morning time scene. A clumsy-looking waitress holds up a glass of orange juice on a tiny, not very stable-looking saucer.
We know she spilled the orange juice.
EDIT: Oh, and how could I forget this picture is being taken from a plane.