>but I'm curious why so many photos of engines and wings over an indiscernible countryside make it onto airliners.net?
Sheesh...I'll bet you're the type of flyer who would rather watch the in-flight movie rather than see different parts of the world from a not-so-everyday perspective.
Seriously, I think it's fun to take these types of shots. It can be very difficult at times, and I get a great sense of satisfaction every time I pull off a "keeper". I agree that some of these types of shots can be quite bland (especially when you can't get the whole wing or engine in the frame), so I only shoot if I have a great angle with good light. Having flown about 60k miles this past year, I only had three or four REALLY good opportunites for nice shots.