Well when you're in the cockpit and it's a military transport plane and you can look at the altimeter out of the corner of your eye, you get to be pretty sure of the "elevation" (Those of us who fly usually call this altitude).
Holy cow! I had no idea that one could capture such a bright cloud against such a dark sky! Guess its a perk of being able to FLY!!! No fair!! :) Favorite!
"Thou therefore endure hardness, as a good soldier of Jesus Christ. No man that warreth entangleth himself with the affairs of this life; that he may please him who hath chosen him to be a soldier." -2Timothy 2:3,4- KJV Bible
43,000 feet? Your just about out in space aren't'cha? Love that deep blue above the clouds. The billowing within the clouds is awesome. Good job of sizing the moment with your camera.
Pat