I'm interested in the information about air routes of all the world. I need information with following features:
- it must be official (not stolen, without violating any license);
- it should be in digital form;
- it should be in WGS84;
- it should cover all of the world;
- it should be free (no payment);
- it shouldn't be detailed (just main routes);
- it shouldn't be actual (current), one or two years outdated is appropriate.
So my question is: whether such information is available and where I can find it?