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
In Soviet ISS, it seems, computers reboot YOU!The failure occurred in computers on the Russian segment of the 16-nation space station — computers that control navigation and critical life-support systems on the huge orbital base. Without them, the station cannot maintain proper orbit and the crew cannot stay on board.
MSDOS is not dead, it just smells that way. -- Henry Spencer