I used to have the BA Desktop timetable application on my laptop, but I noticed recently that it was no longer updating. A quick visit to ba.com revealed that it was discontinued. However, there was a link to the Oneworld timetables, which lands you here:
oneworld - Downloadable Timetables
You can get a PDF copy of the timetables, but there are also downloadable tools for various types of hardware. I downloaded the desktop version and it is almost exactly like the old BA Desktop Timetable! Especially if you set the filter fo BA flights only...