I've used BNA twice in a little over a year...only because southwest has a non stop from my hometown and I had a rare non commutable weekend trip. It was fairly easy and a one way car through Costco was in the $50-75 range. IND and CVG are a little closer, but, typically requires a connection from some hub from pretty much anywhere. I can't see this being a regular occurrence for anyone...but, it's an option.