Not sure if you know or not (or care ), but for those who customize routes table for their own use, there is small bug:

It appears that if you have a city pair, and equipment for same airline is different one way vs. the other, the tool does not display it. for example:

in your routes.dat file you may have

YX CLE MKE * 0 733
YX MKE CLE * 0 735

when you highlight the route, tool tip will show only the first one as so:

"YX Midwest Airlines | 733"

Otherwise, great tool! Thank you and Cheers!