Flying over the Alps, coming back home in the evening, I noticed the clouds below moved by strong winds in many waves, following the orography of the mountains. I found interesting this effect, especially if compared with the clear sky over them. I choose to use black and white because it stress the attention to the wave shapes.
Update: this image has been one of the 15 most popular pictures in the weekly themes by VFXY for the July 24, 2009 week, when the theme was “Null or Empty” 
Wow, beautiful, looks so calm and wide.
Beautiful! Always afraid to turn on my camera when flying, those flight attendants are vicious re: electronics
nice soft effect
Every time I fly I either never gets the window seat or the window is too dirty to take a picture out off.
Top photo, great choice re: B&W.