Short version: It's open-source, open data (export/import allowed) and has a much cooler zoomable map. Plus it can tell you how much you still need to fly to get to Mars.
Long version: http://openflights.org/faq
"Today's robots are very primitive, capable of understanding only a few simple instructions such as 'go left', 'go right', and 'build car'." --John Sladek