Surely, a most rudimentary VFR map of the world with known airports marked out should be a dead easy app to develop, no?
Well, it's not quite an app, but The Pilots Free Flight Atlas does pretty much that. Two volumes cover the whole world. Well, most of it. Central Afrika and the Siberia/Mongolia/China region are missing from the "Eastern Hemisphere" edition. But if you're planning a trip from, say, Iceland to Tokyo you are pretty much covered all the way.
So far I've only used it for dreaming though...
pilots atlas - The Pilots' Free Flight Atlas :: taking navigation a step further: Home
Taken from this tread, there is supposed going to be an app too.
http://www.pprune.org/questions/4928...ots-atlas.html