In a nutshell, it's a tool that lets you map your flights around the world, search and filter them in all sorts of interesting ways, calculate statistics automatically, and share the resulting maps with friends and the world. You can also check airport route maps for nearly every airport in the world and find out what airlines fly where.
More on data format at:
As of October 2009, data is available under the Open Database License (ODbL):
Retrieved 08:17, May 21, 2013 (UTC).
the Data Hub