In January 2016, I was on a flight from London to San Francisco and photographed this prominent mountain (the large one, roughly in the centre of the horizon). Can anybody identify it?
The photograph was taken approximately over Banks Lake in Washington State; the camera was pointed somewhere between west and north-west. In case it helps anyone judge the scale, the photo was taken with a 50mm lens on a camera with a 1.6x crop factor. I cropped the image to 16:9 by removing some sky; the width of the image is the original field of view.