Such old news. The cheapest carrier on a route can easily be calculated on EACH day leading up to departure!" Prices change by the hour on all carriers now.
All carriers - and other commercial companies - see it in their interest to make the pricing as complicated as possible. (Yes, I know they
say that it is simple but that is only one-booking enquiry at a time!) If one carrier changes one of the prices, then all calculations must be done again. I could book for Rome today on BA and in 1 minute/hour/month it will be cheaper with someone else.
Which is why you have to book according to your required schedule but don't mention that to hack who might want to do BA a favour.
