is right. The e-timetables are not consistent with the .pdf (or printed) timetables. And the PDA version is even worse.
The biggest error I see is a/c type in the timetables (though it may have changed - instead of being an error) and occasionally the frequencies for non-dailies are incorrect.
For instance, I saw a B762 in CVG
departing today in the 09:00 departure window, and can't figure out where it was going. On my entire flight, I'm trying to see where they have the 762 going (barring equipment substitution).
Overall, the timetables are pretty good, average among US airlines - easier to use than NW