I'm planning a trip around the world and would like to plot my flight routes (only approximately) between cities. It doesn't even have to be the precise routes -- just lines (or splines) connecting the cities.
I've looked all over and have not found anything that does this. The Great Circle Mapper webpage is totally inadequate since it doesn't output in a nice high resolution format, and was probably not really made for this purpose anyway.
Can anyone recommend a site or software that does this well?