I wholeheartedly recommend Sporty's (and once made a pilgrimage to the physical location).

I have another related question. I was watching (in-flight) a documentary about the early days of commercial air travel, 1940s-50s. I saw a lot of people in the footage of those flights looking out the windows with binoculars.

Has anyone tried this? Is it worth it, now that planes fly higher than they did then? How is the view thru the plane window? How good do your binoculars need to be to see something five miles down? Maybe this is only good for commuter flights, but commuter flights are so short and go over relatively uninteresting territory.