A new version of my Real Costs plugin is now available as an xpi and a greasemonkey script. This version has a better interface that allows you to toggle between a large version (with full information) and a much smaller, more functional graphic that is more suited to regular use. This version now includes every airport in the world (with a three letter airport code), and many more airlines. In the revisions leading up to this release, I added auto-updating to the .xpi, so install it once, and it will keep itself current. Meanwhile, I am making significant progress on the car directions component.