Mycombs,

Maybe I don't quite understand what problem that you are having, but the Oneworld timetable, which was updated on 12/11, is showing London to Calcutta three days a week for the week I checked (mid-February). It also shows a slew of other destinations. If youre using the AA timetable (which I find useless so I don't use), then you might want to install the Oneworld Timetable. It's on aa.com right underneath the AA timetable link. The only other problem that might be happening is that if you are checking way into the future, such as next July or something, then sometimes the timetable won't reflect the flights accurately.