What is this? This tool plots a route using FAA fixes. This is useful for visualizing a path that an airplane will take. Lists of fixes for a particular flight can be obtained from fboweb.com. Note that this only works for airspace that the FAA is responsible for.
For example, here is a route taken by flight UA 1, ORD–HNL:
KORD PLL GOTHC FOD RAP CZI BOY MLD FMG SWR SAC OAK FABLA PIRAT CINNY STEVN DOPPS DIALO DEROK DANKA DUFFE DENNS MAGGI JOELE BAMBO GRITL CKH PHNL — try it out!
Disclaimer. Don't use this for navigating an actual plane! There are no guarantees that it works 100% of the time.