Today I was just comparing prices on the BA/IB websites for a weekend away in April and came accross something that confused me - they don't seem to show the same flights/times. Is it a case that one website has the timings wrong, for example a timetable which hasn't yet been updated? Or do they show different flights between both websites all of which do actually operate?

For example, returning between 2-5 PM on 21st April MAD-LHR.

The BA site shows :

14:20-15:35 BA0459 operated by BA
14:55-16:20 BA7060 operated by IB
15:55-17:20 BA7058 operated by IB
16:50-18:05 BA0461 operated by BA

The IB site shows:

14:20-15:35 IB7444 operated by BA (this matches the above)
15:00-16:20 IB3172 operated by IB (could this be the same as the 14:55 above on a slightly amended timetable?)
16:30-17:50 IB3166 operated by IB (is this an additional flight to the ones shown on the BA site, or one of the above flights re-timed?)
16:50-18:05 IB7446 operated by BA (this matches the above)

So as you can see, there is a slight discrepancy with the timings of those 2 flights in the middle of that period.