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
"Who cares if it doesn't do anything? It was made with our new Triple-Iso-Bifurcated-Krypton-Gate-MOS process ..."