>40,000 ft
I recall when planes were being redirected, many of them were flying at 40,000 ft. Was that a clue for us? This isn't a normal altitude for commercial flight.
I am finally working with data again for my blog. The tools I need for moving forward are pretty well stabilized now. Right now, I am going through the Q post graphics. For some reason, one of them is too small to read. Is a larger version of the graphic with a pic of A. Cooper in it available?