Travel has the longest and least linear research journey in consumer marketing. Someone browses on a phone at lunchtime, researches on a laptop that evening, compares on three OTAs, disappears for a fortnight and books on a tablet. Any measurement approach that assumes a single device and a short window will misread almost every booking.
It also has a personalisation problem that most sectors do not: the thing you are personalising changes by the hour. A segment built yesterday is worthless if the property is now sold out or the fare has moved. Travel personalisation has to reach live inventory and pricing, not a nightly export.
And the price is not marketing’s to promise. Revenue management sets it, distribution moves it across channels, and a personalisation programme that ignores either will show a guest a rate that no longer exists. The good programmes are built with revenue management in the room, not presented to them afterwards.