multiple eye witnesses on commercial flights even more reports on Concorde flights at higher altitudes
https://jkurtschmidt.wordpress.com/2011/03/17/a-clear-day-from-40000-feet/
Sinai Penisula...
Okay, let's take a look at that on google maps....
Let's zoom out some..
okay let's zoom waaaay out...
Still think you're looking at a curve?
Or is that just another wide angle distortion?
40K aint nothin but a 5K ft difference from a regular flight. You see a straight horizon at 35K and a curved one at 40K?? According Road Rage you gotta go way higher .