And meanwhile ...

It's not upside-down. If anything, it's backwards, with the stars in the top right corner rather than the top left. The reason goes back to ships. A flag flown from the mast will - if its fabric is the same all the way through - look correct from the port (left) side and "backwards" from starboard (right) when it's blown toward the stern of the ship. Airlines continue the tradition by painting flags as if they were blown back from the front of the plane.