Thanks, Alex, for starting this topic. I've been meaning to ask the same question. If you can get your hands on the March 1998 Airways magazine, they had a pretty good article titled "Flights of Fiction" covering aviation related novels. I just looked over it again, and interestingly enough, John Nance isn't even mentioned in the article, after most previous posters have recommended (sp?) his work.
One book reviewed and not yet mentioned, that I think sounds interesting, is Flameout by Basil Jackson. It sounds similar to Airframe to me. Accident investigation on a new wide-body jet which crashes mysteriously in Kansas.