Hi Bjørn,
Are you sure about the Big Dipper in your stars shot from the plane?
I see Canis Major, Orion and Taurus for sure but not the big dipper (Ursa Major)!
Maybe I did not get what you meant.
Anyway, it is a cool shot and probably a rare attempt at astrophotography from a fast moving object!
I know it is also done from satellites but the means developed are not in the same league of course.